Ashes of Outland also sees the arrival of a little mini-expansion of cards, all revolving around the Demon Hunter class, Hearthstone's 10th class. And I know that I've been doing a bit of a revamp on the older Lore of Hearthstone articles, merging many of them... but for Ashes of Outland, I've decided to keep the non-legendaries and legendaries separated.
Anyway... Ashes of Outland! I guess we should talk a bit about Outland itself, huh? Outland used to be known as the planet/world of Draenor, homeland to the orcs and various other races, including, later on, the Draenei that crash-landed there after their escape from their home world of Argus. Like all things in the World of Warcraft, however, Draenor soon fell into ruin. The already violent orcs were exposed to the manipulations of something much more sinister by the monstrous machinations of the Warlock Gul'dan, who, unbeknownst to the other orc leaders, have contacted and struck a bargain with the demons of the Burning Legion. Gul'dan got most of the orcs of Draenor to drink the blood of the demon Mannoroth, which corrupted them, bound their souls to the Burning Legion and drove them into far greater levels of barbarism than before, which would, eventually, lead to the formation of the first Horde, which poured through the Dark Portal into Azeroth to wage war against the humans of the kingdom of Stormwind.
During the Second War (a.k.a. Warcraft II: Tides of War and Beyond the Dark Portal), however, the various events that took place during that conflict would lead to the fall of the Horde, with many defeats and the deaths of many Horde commanders. The rest of the Horde rallied upon the once-deposed shaman Ner'zhul, who planned to open portals to other realms of existence. This plot was uncovered by members of the Alliance expedition, who rushed into the Dark Portal and charged into Draenor to stop this madness. However, during this conflict in Draenor, Ner'zhul's careless portal-opening instead caused the energies to pour into Draenor itself and cause the world to be shattered. To the survivors of the Alliance and Horde who managed to escape back to Azeroth in time, Draenor was presumed to be destroyed...Until the events of the Third War (specifically Warcraft III: The Frozen Throne), where multiple characters found themselves transported through portals into the world that was once Draenor... now a collection of strange, mutated islands floating in the Twisting Nether, known to all as Outland. The renegade demon hunter Illidan Stormrage went into Outland, followed by his pursuer, the warden Maiev Shadowsong, and later on Illidan's followers, the naga sea witch Lady Vashj and the freshly-recruited blood elf prince Kael'thas Sunstrider, arrived and began to come into conflict not just with each other, but also against the mutated residents like the Fel Orcs, the Broken Draenei, and, most of all, the demonic generals of the Burning Legion that are lording over Outland. Illidan defeated all of his enemies, including Maiev and the Pit Lord Magtheridon, and styles himself the new Lord of Outland.
Outland would remain out of bounds to most until World of Warcraft: Burning Crusade, where the Dark Portal, long thought to be dormant, was reactivated, connecting Azeroth to Outland once more. The Alliance and the Horde called a truce to beat back the invading demonic forces, and then beeat the demons back into Outland itself before establishing garrisons there and sending adventurers in expeditions into the hostile and strange world, rescuing old friends, finding new alliances, and fighting against the increasing corruption upon Outland due to both the Burning Legion and the Illidari. Outland itself is divided primarily into seven zones: the Hellfire Peninsula, Zangarmarsh, Terokkar Forest, Nagrand, Blade's Edge Mountains, Netherstorm and Shadowmoon Valley. Eventually, adventurers of the Alliance and Horde would help free Outland and its residents from the evil forces besieging it, slaying Illidan and his lieutenants, as well as those of the Burning Legion. As much as I do enjoy the Hearthstone-original characters, it is pretty refreshing to go back to an expansion that is actually a bit more about Warcraft as a whole, y'know?
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Demon Hunters!
The Demon Hunters first appeared in Warcraft III: Reign of Chaos, as one of the three available Night Elf heroes. The very first Demon Hunter is also the most prominent in the history of Azeroth, Illidan Stormrage, known to many as 'the Betrayer'. Choosing to utilize the powers of the very demons that the night elves fought during the War of the Ancients, Illidan Stormrage had his eyes burned out and fel tattoos marked on his body by the great leader of the Burning Legion, Sargeras himself. Thus, Illidan Stormrage became the first Demon Hunter, fighting under his own code against the demons, and later against the night elf people who sought to imprison him for his unorthodox methods.
While there weren't many of them, there are a few who followed in Illidan's footsteps, ritually blinding themselves in order to develop the demon-hunter abilities that made Illidan so formidable. During the years that Illidan was in Outland after the events of Warcraft III, many night elves and blood elves sought out Illidan for various reasons -- either a thirst for more power, or, far more commonly, the desire for vengeance against the Burning Legion, who took everything from many of these. The training to become a Demon Hunter was a harsh one, involving a ritual where the demon hunter initiate would slay a demon and consume the demon's heart and blood. Only one in five suvive the training -- many went insane or are killed in the rituals, or get taken over by the insane visions granted by the fel energy. All Demon Hunters would be transformed physically, gaining demonic features such as horns, claws and hooves. These Demo Hunters created by Illidan are called "Illidari", and they are given tattoos that keep their inner demon from overwhelming their minds, but the voice of the demon they first slew will always be there on the back of their minds, attempting to turn the Demon Hunter to serve the Legion.
In Warcraft III, Demon Hunters are classified as 'Agility' type heroes, and have access to four skills. The first is Mana Burn, allowing the Demon Hunter to burn a target's mana and dealing damage equal to the amount of 'combusted' mana; Immolation, which sets the Demon Hunter to be engulfed in flames and dealing damage to all around the Demon Hunter; Evasion, a passive ability; and the ultimate ability of Metamorphosis, transforming the Demon Hunter into a hulking, shadowy demon form that also changes the Demon Hunter's damage into chaos damage, which deals extra damage to everything. In World of Warcraft, Demon Hunters are able to pick between two specializations -- Havoc (a damage dealing spec) and Vengeance (a tank spec).
[Minions]
The Glaivebound Adept is original to Hearthstone, but seems to depict the Demon Hunter ability "Throw Glaive", an ability that is somewhat based on the ability of the Huntress units in Warcraft III, which allows the Demon Hunter to launch a glaive that will ricochet from enemy to enemy. In WoW, Demon Hunter players learn and obtain the power to manipulate glaives after slaying the demon Fel Lord Caza.
Netherwalker depicts a Demon Hunter using the "Netherwalk" ability, which is a level-104 Havoc-spec talent that causes the demon hunter to slip into the nether, becoming immune to damage and having increased speed, but also unable to attack.
Wrathspike Brute, despite being classified as a demon, is a Vengeance-spec Demon Hunter who has undergone Metamorphosis, sprouting massive demonic spikes, and presumably, under the duration of Metamorphosis, is considered a demon herself.
[Spells]
Demon's Bite: A level-98 Havoc-spec Demon Hunter ability that deals instant physical damage. Chaos Strike: A level-98 Havoc-spec Demon Hunter ability that costs fury to use, unleashing a large amount of chaos damage with a melee weapon with the chance to recover the fury resource that Demon Hunters use.
Soul Cleave: A level-98 Vengeance-spec Demon Hunter ability, which, like its Hearthstone counterpart, deals a large amount of damage to multiple enemies before the Demon Hunter and recovering health.
Chaos Nova: Chaos Nova is a Havoc-spec Demon Hunter ability that unleashes a blast of fel energy that deals damage and stuns all around them. Chaos Nova is obtained by a quest that involves the Demon Hunter player slaying the fearsome Overfiend Immolanth, and retrieving the Heart of Chaos from the demon.
Blur: A Havoc-spec Demon Hunter ability that grants an increased chance to dodge attacks and reduces damage taken. Demon Hunters will achieve the ability to use Blur upon defeating the eredari commander Bastillax during their escape from the Vault of the Wardens. Consume Magic: A level-103 Demon Hunter ability that dispels a magic buff, and generates the resource of a Demon Hunter (either Fury or Pain depending on the specialization). Prior to Wrath of the Lich King, Consume Magic was a Priest ability exclusive to blood elves that allowed them to consume a buff on themselves to regenerate mana.
Mana Burn: Mana Burn was one of the original Demon Hunter abilities in Warcraft III, upon which the Demon Hunter burns the mana of a target, causing the mana to combust and deal an equivalent amount of damage to the target. It is not a Demon Hunter ability in WoW, and prior to Mists of Pandaria, it was instead a Shadow-Priest ability. Blade Dance: Blade Dance is a level-99 Havoc-spec Demon Hunter ability, which allows the Demon Hunter to strike multiple enemies around him/her at once, as well as increasing the ability to dodge.
Feast of Souls: Feast of Souls is a level-100 Vengeance Demon Hunter talent, which buffs the healing ability of Soul Cleave. Eye Beam: Eye Beam, in addition to it being an attack in the Illidan boss fight, is also an ability earned by Havoc-spec Demon Hunters after completing a quest where the Demon Hunter slays Inquisitor Baleful to take the power to unleash beams of chaos energy from their eyes. Eye Beam will always critically damage anything in front of them.
Immolation Aura: Immolation originated in Warcraft III as one of the Demon Hunter hero's four abilities, where the Demon Hunter will spend mana to unleash an aura of flames that will damaage everything around the Demon Hunter. In WoW, up until Warlords of Draenor, Immolation Aura is an ability available to Demonology Warlocks until it's transfered over to Vengeance Demon Hunters. Immolation Aura works similarly to its Warcraft III counterpart, engulfing the Demon Hunter in flames for a period of time. Vengeance-spec Demon Hunters receive Immolation Aura instead of Chaos Nova upon killing Immolanth.
Spectral Sight: Spectral Sight is a level-98 Demon Hunter ability that allows them to see what is normally hidden, which could be used to reveal hidden demons in the Broken Isles, as well as see enemies and treasures through physical barriers. In lore, Spectral Sight is how Demon Hunters view the world, not with normal visual means like people whose eyes are intact, but in terms of arcane and fel magic contained within them. 
Metamorphosis: Metamorphosis was the ultimate ability of the Warcraft III Demon Hunter unit, transforming them into a hulking, shadow-clad demonic form that dealt increased amounts of damage, utilizing the 'chaos' energy type that is otherwise uniquely used by the demons. In WoW, Metamorphosis was originally a Demonology Warlock ability up until Legion, which transforms the Warlock into a shadowy demon with increased abilities. With the advent of playable Demon Hunters, Metamorphosis is assigned to Demon Hunters instead, available to both Havoc and Vengeance spec Demon Hunters, transforming them into a half-demon form with increased abilities. Havoc-spec Demon Hunters will grow cloven foot and tattered bat-like wings, while Vengeance-spec Demon Hunters will bulk up and grow massive spikes and rocky growths all over their body (as seen in the Metamorphosis card art). 
Skull of Gul'dan: The Skull of Gul'dan is less of an ability of Demon Hunters, but rather a powerful artifact created from the corpse of the orc warlock Gul'dan upon his death in the Second War. After Gul'dan's death when he was torn apart by demons in the Tomb of Sargeras, the skull of the warlock is recovered by one of the surviving orc Warlocks, and the skull ended up finding its way back to Draenor, where it was held by the chieftain of the Bonechewer clan as a trophy before he was slain by Grom Hellscream, who claimed the Skull to Ner'zhul in the shaman's attempt to reopen the Dark Portal. The Skull then exchanged hands from Ner'zhul to Deathwing and finally to Khadgar, who utilized the Skull of Gul'dan to close the Dark Portal. The Skull of Gul'dan managed to be sent back to Azeroth via a gryphon rider, and was held by the Kirin Tor until Dalaran's destruction at the hands of Archimonde during the Third War. The Skull was then used by the dreadlord Tichondrius to corrupt the forests of Ashenvale and Felwood. Illidan Stormrage, recently freed and unleashed to help fight demons, would claim the artifact and absorb its power, using it to destroy Tichondrius and the armies of the Burning Legion. The Skull of Gul'dan, now bereft of power, is still in Illidan's posession, seen prominently in the cinematic trailer of Burning Crusade. The Skull of Gul'dan is a collectible trinket from the Illidan boss fight. The following are original to Hearthstone: the Hero Power Demon Claws, Soul Split, Twin Slice, Coordinated Strike and Command the Illidari. Presumably, Demon Claws refers to the physical mutations granted by the transformation. Inner Demon, meanwhile, refers more to the consumed essence of the demon whose heart is consumed by the Illidari Demon Hunter, which they use to channel fel energies.
[Weapons]
Aldrachi Warblades: The Aldrachi Warblades are the artifact weapons utilized by Vengeance Demon Hunters in the Legion storyline. The Aldrachi themselves were once a proud people that was offered a place by Sargeras among the Burning Legion, but refused to be corrupted and they slew a vast amount of the Burning Legion's forces before being wiped out themselves. The Aldrachi Warblades were the weapons of the Aldrachi's greatest champion, Toranaar, slain by Sargeras personally. Kil'jaeden would grant the Aldrachi Warblades to the Legion-loyal demon hunter Caria Felsoul, who would later be slain by a powerful Demon Hunter (you, the player), who would claim the Aldrachi Warblades for themselves .
Umberwing: Umberwing is one of the many different available 'skins' for the Aldrachi Warblades artifact weapon, obtained after completing the questline "The Highlord's Return".
Flamereaper: Flamereaper, meanwhile, is a skin for the Havoc-specialty Demon Hunter artifact, the Twinblades of the Deceiver. The Twinblades of the Deceiver, Verus and Muramas, are obtained by a Demon Hunter hero (you) who claimed the blades from the treacherous Illidari Varedis Felsoul, a former instructor for the Illidari who was revived by Kil'jaeden and joined the Burning Legion. The Flamereaper skin is obtained upon completing the Xylem Challenge questline.
Warglaives of Azzinoth: The iconic Twin Blades of Azzinoth (a.k.a. Warglaives of Azzinoth) are the legendary blades wielded by Illidan Stormrage. Claimed by Illidan from the dead corpse of the doom guard Azzinoth during the War of the Ancients, Illidan used the Warglaives of Azzinoth throughout many of his battles during the War of the Ancients. Upon being released from his ten thousand years of imprisonment during the Third War, Illidan reclaimed his weapons and used them to devastating effect in the conflicts to come. During Burning Crusade, the Warglaives of Azzinoth are a possible drop from slaying Illidan atop the Black Citadel.
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Demons!
We have a lot of demon cards in the Demon Hunter-centric set.
Shadowhoof Slayer: The Shadowhoof clan of Satyrs are a group of Satyrs that serve Illidan, with Shadowhoof Assassins and Shadowhoof Summoners being found in the Black Temple. "Shadowhoof Slayer" is original to Hearthstone, though. We've covered Satyrs before when talking about Xavius and Terestian Illhoof, but they're essentially night elves that are cursed into a demonic form thanks to Xavius's deal with the Burning Legion during the War of the Ancients, and have proven to be a thorn to night elves ever since. Depending on the sect, Satyrs have been known to be loyal to the Burning Legion, to Illidan, or to even the Old Gods. Illidari Satyr: The Illidari Satyr are level 69 mobs found in Illidari Point in Shadowmoon Valley, noted as "Servants of Illidan". Other Satyrs in the set -- Satyr Overseer and Imprisoned Satyr -- are original to Hearthstone.
Darkglares are a type of demon somewhat similar to Observers, but only have one eye, and have a far more horns around their body. Some variants of Darkglares have five eyes, with smaller eyes around their central eye similar to an observer. They are first sighted during the events of Legion, and Affliction-specialty Warlocks are able to summon Darkglares as minions. Very little are known about the Darkglares, and if they are actually a variant of the Observer demon. Worth noting that some characters refer to the Darkglares as "Beholders", a similar term used to refer to the Observers. The Darkglare in Hearthstone have been extensively modified by the Rusted Legion.
The Ur'zul Horror is an Ur'zul, a demonic creature native to Argus. Formed out of the tormented bodies and souls of the Broken Draenei and fallen membres of the Army of the Light, the Ur'zul takes the form of a hideous, bone-clad hound with multiple faces stitched onto its body, screaming and moaning as it demoralizes warriors who see the faces of their comrades on this creature. The Ur'zul appears to be artificially created shortly after the Eredar joined the Burning Legion. No specific mob is called "Ur'zul Horror" in WoW.
Supreme Abyssal: The Supreme Abyssal is based on Supremus, a gigantic blue Abyssal loyal to Illidan Stormrage that stood guard in the Black Temple. Supremus is the second boss in the Black Temple raid. There isn't a whole ton of lore about Supremus, really, he's just a demon that Illidan has bound to his service. Supremus was meant to be a legendary card in Ashes of Outland, but ended up being converted into a non-legendary card during production.
Priestess of Fury, Nightshade Matron and Scavenging Shivarra are all members of the Shivarra race, a race of six-armed female demons that made their debut in Burning Crusade. Extremely powerful, the Shivarra are masters at swordfighting and serve as priestesses that spread the word of Sargeras, noted to be even more fanatical to the Burning Legion's cause than other demons are. The Shivarra are first seen during the events of the Burning Crusade, where many Shivarra served as high-ranking members of the Illidari and Burning Legion's forces in Outland. Perhaps one of the most well-known among the Shivarra is Mother Shahraz, a high-ranking member of Illidan's forces in the Black Temple, leader of the Den of Mortal Delights in the Black Temple. The highest-ranking among the Shivarra are known as the Coven of Shivarra, four mighty matrons that would be faced by adventurers in Legion as the ninth boss in the Antorus raid.
Hulking Overfiend: Overfiends are massive humanoid armour-clad demons with bat-like wings and are consistently burning with green or purple fel flame. Not much is known about them, and they first appeared during the events of Warlords of Draenor, and many more are seen during the events of Legion. They all seem to be of relatively high rank among the Burning Legion.
Imprisoned Antaen: The gigantic Antaens are massive demons found during the Army of the Light's assault on Argus during the climax of Legion. The Antaen are so massive that Illidan Stormrage and Prophet Velen mistook the head ornament of a submerged Antaen as a siege weapon. There's not much known about them other than their massive size, and the ability to utilize their heads as portals to summon additional demon reinforcements. A particularly notable Antaen is Kin'garoth, Engineer of the Apocalypse, the seventh boss in Antorus, the Burning Throne.
The Pit Commander is a massive level 72 Pit Lord that commands the forces of the Burning Legion in the Stair of Destiny in Hellfire Peninsula, summoning armies of Infernal Siegebreakers in an attempt to retake the Stair of Destiny and control the Outland side of the Dark Portal.
Imprisoned Felmaw: Otherwise original to Hearthstone, the Imprisoned Felmaw is a Fel Beast, otherwise known as a Fel Core Hound. While they look similar to the Core Hounds of Azeroth and the Firelands, Fel Beasts are made out of green fel instead of lava. They first appeared in Burning Crusade, created out of the fel-corrupted volcano Hand of Gul'dan.
Mo'arg Artificer: Mo'args are a race of demons in service to the Burning Legion, and, in fact, even the mighty Felguards and Fel Lords are also part of the Mo'arg race. The dimunitive tinkerers known as Gan'arg are also from the Mo'arg race. The term 'Mo'arg' itself is often used to refer specifically to a type of Mo'arg that resemble giant humanoids who have had their arms replaced with gigantic pincers and buzzsaws, with one eye replaced with a cybernetic replacement. These cyborg-like demons also double as tinkerers, blacksmiths and engineers of the Burning Legion, and many of these Mo'args are seen as part of the Burning Legion's efforts in Burning Crusade.
Imprisoned Gan'arg: Gan'arg are stunted, deformed members of the Mo'arg race that serve the Burning Legion as engineers, creating the massive fel cannons and other sorts of technology used by Legion minions. Gan'args are intelligent and cruel, often employed as helpers for their larger brethren. They are first seen during the events of Burning Crusade, as part of the Burning Legion forces in Outland. By the time of Legion, however, their position as engineers in the Legion seem to be largely replaced by Wyrmtongues.
We covered Observers (or "Floating Eyes") many times
before, with their first appearance in Hearthstone being the Floating
Watcher in Goblins vs. Gnomes. Sightless Watcher and Imprisoned Observer are both original to Hearthstone, with Sightless Watcher being a particularly fun concept of a Demon Hunter Observer. We've covered Vilefiends before in Saviors of Uldum. Imprisoned Vilefiend and Battlefiend are both Vilefiends which are original to Hearthstone. Disguised Wanderer is original to Hearthstone,and is actually an Inquisitor demon. We covered Inquisitors in Witchwood with Felsoul Inquisitor. We also covered Terrorguards before in Rise of Shadows with Portal Overfiend, and Terrorguard Escapee is original to Hearthstone.The Enhanced Dreadlord and Desperate Dreadlord are both female Dreadlords, which are, so far, original to Heroes of the Storm and Hearthstone -- and, in particular, these Dreadlords have also been cyborg-ified by the Rusted Legion. Imprisoned Scrap Imp is also an imp that has been modified by the Rusted Legion. Imprisoned Homunculus is also original to Hearthstone, as is the concept of Homunculi as fat, imp-like demons -- WoW's Homunculi are shape-shifting demon infiltrators.
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Naga!
During the events of Warcraft III: The Frozen Throne, a large group of Naga allied themselves with Illidan Stormrage, serving as the Betrayer's army as Illidan moved through Azeroth in search of a way to destroy the Frozen Throne and end the threat of the Scourge. Eventually, however, Illidan ended up exiling himself to Outland after a confrontation with Malfurion Stormwind and Tyrande Whisperwind. The remaining naga loyal to Illidan were gathered up by Lady Vashj, and struck an alliance with the mana-starved blood elves under the leadership of Kael'thas Sunstrider, and ended up journeying to Outland to ally themselves with their master Illidan once more.
During the events of Burning Crusade, a significant part of Illidan's army includes these Naga, which have multiplied and have became vile taskmasters and slave-drivers.
Wrathscale Naga: The Wrathscale Naga are level 7-8 male Naga found on Azuremyst Isle, part of the Blood Elven starting area. Blood elf adventurers would be sent by Priestess Kyleen Il'dinare to slay these Wrathscale naga in order to reclaim the ruins. The Wrathscale tribe of Naga primarily besiege the Azuremyst Isles, and are also opposed by other forces in the region like the Draenei and the furbolgs. They are led by Warlord Sriss'tiz, who would be felled by a group of blood elves.
Coilfang Warlord: No specific mob corresponds to the Coilfang Warlord, but he is a Naga Lord. Naga Lords are red-skinned, uniquely powerful members of the Naga race that seemingly have had parts of their body fused with giant sea organisms, with the upper part of their heads seemingly covered with a shell, their left arms having a huge shellfish as a pauldron and their right arm transformed into a gigantic hermit-crab-like creature. In Burning Crusade, only one such creature exists, High Lord Naj'entus, trusted champion of Lady Vashj and serving as the first boss of the Black Temple, but more Naga Lords would be seen during the events of Cataclysm, Legion and Battle for Azeroth. In fact, the card was meant to depict High Lord Naj'entus himself before the decision to cut down the amount of legendary cards for the set was made. Serving as the first boss of the Black Temple, Lord Naj'entus fought loyally against the army of adventurers that assaulted the Black Citadel, but was ultimately felled by Akama, Maiev Shadowsong and a group of adventurers.
The Coilfang Tribe itself is the largest tribe of Naga serving Illidan Stormrage, and the tribe that Lady Vashj herself hails from. The Coilfang Tribe make their base in the massive Coilfang Reservoir, which contains four dungeon instances.
Broken Draenei!
Many members of the Draenei race left behind in Draenor when it was transformed into Outland ended up being corrupted by the fel energies of Outland into Broken (also known as 'Krokul' in their language), and many sought help from Illidan Stormrage and his forces when they arrived on Outland, seeking their aid against the forces of Magtheridon and his army of demons and fel orcs during the events of Frozen Throne. Circa Burning Crusade, the Broken tribes of Outland ended up mostly working underneath the Illidari, either willingly or unwillingly. Many Broken Draenei lost their original Draenei abilities to channel the Light, and most of the non-Illidari allied Broken are part of the Ashtongue Deathsworn faction, which allied with Alliance and Horde members in order to face off against Illidan Stormrage's forces. Notably, the group of Broken survivors have seemingly embraced shamanism as an alternative religion, with the shaman Nobundo being a particularly prominent Broken. During Burning Crusade, the Draenei of the Alliance sought to reconnect with their Broken kin, with the Kurenai tribe being receptive to this. As of Cataclysm, some Broken tribes have crossed over to Azeroth and built settlements there. 
The Ashtongue Tribe is led by Akama, and are comprised of the most bloodthirsty and brutal members of the Broken/Draenei race. Most vile among them have formed the Ashtongue Deathsworn sub-faction, which, on the front formed the worst of the worst, but are actually planning with Akama to overthrow Illidan Stormrage. Ashtongue Battlelord are level 72 mobs found in the Black Temple, loyal to Illidan. Slaying them helps you gain reputation with the Deathsworn.
Ashtongue Slayer and Soulbound Ashtongue are original to Hearthstone, but are members of the Ashtongue Tribe.
Greyheart Sage is a member of the Greyheart tribe, another tribe of Broken Draenei loyal to Illidan Stormrage. The Greyheart tribe inhabit Serpentshrine Cavern, working beneath the Coilfang Naga. No specific mob is called "Greyheart Sage", however.
Fungal Creatures & Bogstroks!
Infectious Sporeling: No specific mob called "Infectious Sporeling" is found in WoW, but Sporelings are featured pretty heavily in Ashes of Outland, particularly in the druid card artwork. Sporelings are a peaceful race of mushroom men native to Outland, living in the bogs of Zangarmarsh. Zangarmarsh has a large amount of giant mushrooms, and the Sporelings make their home there, in their capital of Sporeggar. Sporelings are normally fearful of travelers, but are quick to welcome adventurers that come nearby, seeking the aid of the strange outsiders to rescue them from other enemies like fungal giants, spore-walkers, marsh beasts and the naga invaders. The Sporelings have their own unique culture, and adventurers will have to barter with them using their preferred currency -- shiny mushrooms called glowcaps. Perhaps the longest and biggest threats to the Sporelings are the Fungal Giants -- they used to be able to drive them away with spears and stones, but recently the Fungal Giants have became so aggressive that the Sporelings are no longer be able to drive them away. The Sporelings themselves are led by the kind Archspore Msshi'fn, who appears as a legendary card in Hearthstone. 
Bogstrok Clacker: The Lobstrok are a race of humanoid lobster-like creatures native to Outland. Many of the Lobstrok were killed during the transformation of Draenor to Outland, but the Lobstrok population living near the Zangar Sea survived and migrated to Zangarmarsh. Lobstrok are the equivalent of the Makrura in Azeroth, mostly living underwater but also often found populating beaches and watersides. Lobstroks are carnivorous, and larger specimen will feed on humanoids. The specific mob called "Bogstrok Clacker" are level 63 mobs found in Marshlight Lake. Other Humanoids!
Apexis Smuggler: The Apexis Smuggler is original to Hearthstone, but 'Apexis' itself are powerful crystals that were used by the ancient Arakkoan empire known as Apexis, and Apexis Crystals are used as currency both on Outland and the alternate-timeline Draenor. The Apexis Smuggler's tabard identifies him as a member of the Scryers, a group of blood elves led by Voren'thal the Seer who broke away from Kael'thas's group, and offer their help to the Naaru in rebuilding Shattrath City, competing with the draenei Aldor group. Adventurers are able to side with either the Aldor or the Scryers. The Starscryer, otherwise also original to Hearthstone, is also a member of the Scryers. 
Aldor Attendant and Aldor Truthseeker are titles original to Hearthstone, but they are draenei members of the Aldor faction.The Huntress token created by the Terrorguard Escapee shares its name with the Huntress unit from Warcraft III, where the Huntress were the fast-moving warriors of the Night Elven people who charge into battle riding Nightsabers, with the ability to toss spinning glaives at the enemy. Huntresses are able to Shadowmeld and disappear during the night. In addition to their battle capabilities, when upgraded, Huntresses are able to make their glaives bounce off to additional foes, as well as ask owl companions to help keep vigil on a tree to allow them to see the movements of enemies nearby.
Crimson Sigil Runner is not a demon hunter, but rather, a regular old blood elf. The Crimson Sigil are a group of blood elves that remain loyal to Illidan Stormrage, and did not leave his side like the Scryers, or the Blood Elves that went over to the Horde, or the Blood Elves that followed Kael'thas Sunstrider after his rebellion. The Crimson Sigil are based in Shadowmoon Valley, led by Torloth the Magnificent.
Sethekk Veilweaver is a member of the Sethekk faction, which, among the various different Arakkoan faction in Outland, believe themselves to be the most true and loyal follower to the Master of All Arakkoa... which do not correspond to any of the known gods that the other Arakkoa worship. The Sethekk originally worshipped (and named themselves) after the primal god Sethe, but they quickly abandoned worship of Sethe in favour of the unnamed Master... which turned out to be an unnamed Old God that they attempted to summon. Led by Talon King Ikiss and Darkweaver Syth, they emerged from their stronghold of Skettis and set out to summon their master in the ruins of Auchindoun. The Sethekk unleashed the power of Sethe to summon the raven god Anzu, and bind him to their power. Adventurers of both the Alliance and the Horde put a stop to this, slaying the mind-controlled Anzu, the Sethekk overlords, and the unnamed Summoned Old God that they brought to Draenor.
The Dragonmaw Sentinel, Dragonmaw Overseer and Dragonmaw Sky Stalker are all members of the Dragonmaw Clan, and, more specifically, they (and the representatives of the Bonechewer) are all Fel Orcs, red-skinned and red-eyed orcs that have been transformed after direct and continual consumption of demonic blood. Multiple groups of orcs in Outland have been transformed into fel orcs by Magtheridon during his rule over Outland, and have taken to calling themselves the Fel Horde, pledging allegiance to the Illidari during the events of Warcraft III: The Frozen Throne and Burning Crusade. The alternate-universe Iron Horde from Warlords of Draenor have also been transformed into fel orcs by Mannoroth. The Dragonmaw Clan (or "Nelghor-shomash", known as 'Cry of the Beasts' in orcish, originally referring to how they tamed the winged rylaks of Draenor) is one of the original clans that formed the Old Horde, led by the shaman Zuluhed the Whacked. The Dragonmaw accompanied the Old Horde to Azeroth, and was instrumental during the Second War when they, assisted by the treacherous Deathwing and the artifact known as the Demon Soul, enslaved the Dragon Queen Alexstrasza and forced the red dragons to serve the Horde as mounts during the Second War. A group of heroes organized by Alexstrasza's consort Korialstrasz managed to foil the Dragonmaw's plan, however, and the clan was decimated in battle in the fortress Grim Batol. Many of the Azeroth-bound Dragonmaw members escaped to the Wetlands, where they continued to battle the Wildhammer Dwarves.Part of their clan, including Zuluhed, remained in Outland and ended up pledging their service to Illidan Stormrage, enslaving the nether drakes of Shadowmoon Valley. Many of these Outland members of the Dragonmaw became Fel Orcs, and the Dragonmaw Sky Stalker are level 71 fel orcs mounted on nether drakes that patrol the Illidari Training Grounds in the Black Temple. However, as forces of the Alliance and Horde waged war against the Illidari forces, the forces of the Dragonmaw are thinned out and Zuluhed himself was slain. The Outland Dragonmaw fel orcs, led by the violent Mor'ghor, attempted to crossover to Azeroth to enslave their uncorrupted kin, but were beaten back by the leader of the Azeroth-bound Dragonmaw, Warlord Zaela, who at the time sought the assistance of Garrosh Hellscream, warchief of the New Horde. Garrosh then recruited the Azerothian Dragonmaw. Over time, the Dragonmaw became supportive of Garrosh's more violent tendencies. They sided with Garrosh against the rest of the Horde and Alliance, and served as enemies against the Alliance and Horde during the Siege of Orgrimmar, and the survivors would ally themselves with the Ironmarch during Warlords of Draenor.
The Bonechewer Raider, Bonechewer Brawler, Bonechewer Vanguard and Bloodboil Brute are all members of the Bonechewer Clan, which dwelled in northern Tanaan Jungle, and are named as such due to their willingness to resort to cannibalism in times of hardship, often ornamenting themselves with the broken bones and ruined parts of their enemies. The members of the Bonechewers were once part of the larger Bleeding Hollow Clan, but the jungles of Tanaan were perilous, and many orcs went mad -- and the Bleeding Hollow would cast out these unstable members of their clan, and these exiles would form the Bonechewer Clan. The Bonechewer Clan grew large enough over the years that they were present when Blackhand gathered the many clans of Draenor and announced his intention to create the Horde. The Bonechewers were left behind on Azeroth during the Horde's journey through the Dark Portal, deemed to be one of the 'troublesome' clans that were likely to be insubordinate. During the events of the Second War, Grommash Hellscream, under direction of Ner'zhul, slew the insubordinate chieftain of the Bonechewers, Hurkan Skullsplinter, and claimed the Skull of Gul'dan from him. Hellscream gave the Bonechewers the chance to submit to the Horde once more, and the new chieftian, Tagar Spinebreaker, was willing to do so.
The Warmaul Challenger borrows her name from the Warmaul tribe, a tribe of ogres that primarily inhabit Nagrand, led by Cho'war the Pillager as well as former Horde commander Mogor the Ogre. The Warmaul used to be under the slavery of the Gronn, until Cho'war forced the Gronn out of Warmaul Hill and declared himself king of the Warmaul. In Burning Crusade, the Warmaul ogres are constantly in conflict with the Boulderfist tribe.
The Hellfire Warders summoned by Magtheridon is a reflection of the Magtheridon boss fight in WoW. These orcs are assigned by Illidan to keep Magtheridon chained up and at bay, and adventurers must kill the Warders before they can face Magtheridon himself.The following are original to Hearthstone: Frozen Shadoweaver, Cursed Vagrant, Overconfident Orc, Ethereal Augmerchant, Rocket Augmerchant, Guardian Augmerchant, Spymistress and Blackjack Stunner. Blackjack Stunner probably drew its name from the Rogue talent Blackjack, which used to buff the Sap ability. The title 'Spymistress' (or Spymaster) are held by many master rogues specializing in espionage.
The Rustsworn Initiate, Rustsworn Cultist and Ruststeed Raider are all original to Hearthstone and are members of the enigmatic Rusted Legion, the mysterious group that are enhancing demons and other denizens of Outland with mechanical augmentations.
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Beasts, Murlocs, Elementals and Mechs
Marsh Hydra shares its name with level 107-110 hydra mobs found in Azsuna and Val'sharah, but the Hearthstone card clearly depicts a Draenorian hydra that has been outfitted with mechanical armour by the Rusted Legion.
Helboars, or "Felboars", are spiny, mottled boars native to Draenor that were once domesticated by orcs. During Draenor's transformation into Outland, it seems like the fel energy that mutated much of Draenor have also given these Helboars some additional mutations as well, like the ability to breathe fire. They first appeared in Warcraft II as neutral creeps that wander around the land of Draenor, while 'Felboars' wander around Outland in Warcraft III, again, as neutral creeps. They were added into WoW in Burning Crusade when adventurers entered Outland, with various Helboar mobs populating Outland. The specific mob called just a 'Helboar' is a level 52-53 mob located in the Blasted Lands, although they were removed in Cataclysm.
Glowfly: The Glowfly is a Firefly, a type of insect with a prominently glowing abdomen. Fireflies are found in Azeroth and Outland alike, and in the swamps of Zangarmash, fireflies are used by Sporelings as a light source to avoid other hostile creatures in the swamp. No specific mobs are called a 'Glowfly', but several capturable firefly battle pets, like the Effervescent Glowfly and Darkmoon Glowfly, do use the term 'glowfly'.
Clefthoof: The Clefthoof have technically shown up in Hearthstone all the way back since Classic, because the artwork for Stampeding Kodo actually depicts a Clefthoof instead of a Kodo Beast. Clefhooves are large, hairy rhino-esque beasts native to Draenor, and some orcs ritually hunt clefthooves and domesticate them as beasts of burden. In Outland, the only population of Clefthooves left are in Nagrand, where the natural land are still unspoiled and untouched by the fel corruption that has ravaged much of Outland. Since then, Clefthooves have shown up in Azeroth, seemingly introduced by adventurers who travelled to Outland. In Warlords of Draenor, the Clefthooves of alternate-timeline Draenor have apparently evolved differently, with gigantic tusks and horns, as well as spikes all over their body.
Felfin Navigator and Furious Felfin are original to Hearthstone, but the term 'Felfin' borrows from the fel-corrupted brood of Murlocs in the Broken Shore, once known as the Stonefin tribe. The idea of a Murloc Demon Hunter, surprisingly enough, isn't even original to Hearthstone, with the Murloc Demon Hunter Murgulis appearing in Legion, assisting adventurers in the location of Morheim in killing the dreadlord Zemorath.
Imprisoned Sungill and Sungill Streamrunner are original to Hearthstone, and are part of Murgur Murgurgle's group of Murlocs that passed through the Dark Portal to Outland.
Blistering Rot shares its name with level 61-62 ooze mobs of the same name that wander around Hellfire Peninsula. When the Pit Lord Aggonar died, his fel blood poured into the sacred springs of the Draenei and fouled the waters, turning them into the Pools of Aggonar, and nasty creatures like the Blistering Rot spawned from them. A draenei elder called Amaan the Wise would hire adventurers to slay the Blistering Rot in an attempt to cull the fel presence in the pools.
Shattered Rumbler is based on level 65-82 Earth Elemental mobs that are found in the southern edge of Nagrand of the same name. Shattered Rumblers patrol the area as it slowly crumbles off into the Twisting Nether. Note that the artwork for the Shattered Rumbler uses the new model for the Earth Elemental, which came into effect as of the Battle for Azeroth expansion, featuring a similar but distinctively different look.
The Scrapyard Colossus is original to Hearthstone, but represents a Colossus that has been altered like many residents of Outland with the cybernetic enhancements of the Rusted Legion. Normally, Colossi (sometimes "Crystal Giant" or "Earthen Giant") are a variant of Mountain Giants, massive earth elementals that could be found in both Outland and Azeroth who have crystaline spikes jutting out of their shoulders and backs. Notable Colossi in the Burning Crusade include the colossi led by King Goliathon, which were driven insane by one of Kael'thas's minions, Panthaleon the Calculator.
The water elemental Marshspawn is original to Hearthstone. The Augmented Porcupine is also original to Hearthstone (we covered porcupines when talking about Totem Cruncher), and so are the Mok'nathal Lion and Burrowing Scorpid.
Skeletal Dragon is, obviously, an undead dragon, but no specific mob or mount has the name 'Skeletal Dragon'. Most undead dragons are known as 'frost wyrms' anyway, raised and imbued with ice magic by the powers of the Lich King.
The two mechs Scrap Golem and Replicat-o-tron are both original to Hearthstone.
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Weapons
Underlight Angling Rod: This weapon is based on the Underlight Angler, an artifact fishing pole added in Legion. It is obtained as the result of a particularly high-level fishing quest, crafted by Marcia Chase, who tasks adventurers to slay the deep sea murloc Mglrrp in Val'sharah. Mglrrp's body and skeleton is then utilized to create the Underlight Angler, and it is one of the best fishing rods in the game, also granting players to teleport to the nearest fishing node.
Boggspine Knuckles is a one-handed level 115 fist weapon that drops from the gigantic fungal giant Hungarfen in the Underbog raid.
Bulwark of Azzinoth is an epic-rarity shield that drops from the Illidan Stormrage boss in the Black Temple, and is considered one of the most valuable drops from that boss. It is noted to originally be used as the breast-plate of the doomguard Azzinoth before his death at the hands of Illidan Stormrage.
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Spells
Ironbark is a Restoration Druid ability added in Mists of Pandaria, where the druid hardens their skin to be as hard as Ironwood trees. In Hearthstone, the Sporelings have taken a far more literal approach to 'Ironbark', actually stapling on iron armour onto a Sporeling. Overgrowth is a druid honor talent added in Legion, available to Restoration-specialty druids that instantly applies four spells -- Wild Growth, Regrowth, Lifebloom and Rejuvenation -- at once. It's also the name of a forest in the Southern Barrens.
Germination is a level 90 Restoration Druid talent added in Warlords of Draenor, allowing druids to cast the spell Rejuvenation twice on the same target.
Nagrand Slam is a quest achievement earned by completing a series of quets in Nagrand. Nagrand itself is a zone located in Outland, southwest of Hellfire Peninsula, and is noted as the last unspoiled, unscarred region of Outland. Prior to the destruction of Draenor and its transformation to Outland, Nagrand was the sacred meeting ground of the orcish shamans. One of the most notable things to come out of Nagrand is the discovery of the uncorrupted Mag'har orcs in the village of Garadar, where a certain young Mag'har orc, one Garrosh Hellscream, would be discovered and recruited by the Horde, and eventually become one of the most infamous characters in Azeroth's history. Evocation is a level 20 Arcane-specialty Mage ability that allows the mage to recover mana extremely quickly, even during battle.
Deep Freeze is a Frost-specialty Mage ability added in Wrath of the Lich King and removed in Legion, which stuns a frozen target further.
Incanter's Flow is a level 45 mage talent added in Warlords of Draenor, causing a cycle of buildup of increased damage that cycles from 20% to 4% every ten seconds.
Font of Power is not an ability in WoW, but rather a little structure found in front of every mythic dungeon in Legion, and players are able to insert a Mythic Keystone to start a "Mythic Plus" dungeon, which would increase the difficulty of the raid.
Libram of Justice, is a relic. They are added in Burning Crusade but removed in Wrath of the Lich King. The Libram of Justice (or, rather, Gladiator's Libram of Justice) are able to be equipped by paladins, shamans and druids.
Libram of Hope, on the other hand, is exclusive to Paladins, a drop from the boss Isalien in Dire Maul. Like the other relics, it was eventually removed, although the Libram of Hope was added in vanilla and removed in Mists of Pandaria. Hand of A'dal is a title that is achieved for players that completed the attunement quests for Mt. Hyjal and Black Temple prior to Patch 3.0.2. A'dal is the Naaru leader of the Sha'tar, and rules the Draenei of Shattath with a gentle demeanour, and A'dal is a central quest giver for much of the Shattrath quests, and alongside M'uru and O'ros, A'dal is one of the three Naaru who volunteered to help the people of Outland against the invasion of the Burning Legion.
Renew is a level 12 Holy-specialty Priest spell, healing them instantly and placing a buff that also heals them over time.
Apotheosis is a level 100 Holy-specialty Priest talent added in Legion, where the Priest enters a 'pure holy form' and increasing the effects of your spells and discounting all the costs of Holy Words.
Soul Mirror is based on an item of the same name, a magical crystal that allows the cultists of the Auchenai to communicate with the spirits of the dead. The card's artwork depicts Exarch Maladaar, the leader of the Auchenai. Driven mad due to the destruction of Auchindoun and the continued battle against the Horde and the Burning Legion, one of the things that the madenned Maladaar did was to use an artifact called the Soul Mirror to summon the spirits of the dead. Ambush is level 14 Outlaw-specialty Rogue ability that can be unleashed while the Rogue is in stealth, unleashing a large amount of damage instantly.
Dirty Tricks is a level-75 Outlaw-specialty Rogue talent added in Mists of Pandaria, which allows the Rogue to use several abilities (Sap, Gouge, Blind and Cheap Shot) without expending energy.
Serpentshrine Portal is a reference to the Serpentshrine Cavern, one of the four raid wings of Coilfang Reservoir. It's a 25-man raid instance with six bosses, with the final boss being Lady Vashj herself.
Torrent is a Restoration Shaman talent added in Legion that increases the healing effects of the spell Riptide.
The Shadow Council is a major force in Old Horde politics. When the demon lord Kil'jaeden contacted the hateful orc Gul'dan and decided to orchestrate the events that would lead to the orc invasion of Azeroth and the eventual bloodshed that would happen, Gul'dan quickly realized that the orc clans of Draenor will never accept him as warchief, and to this end, Gul'dan pulled strings to get Blackhand of the Blackrock Clan, a mighty and much-respected warrior, into a position as Warchief of the Horde. Meanwhile, Gul'dan brought together a group of warlocks, necrolytes and sorcerers into a secret clandestine group, the Shadow Council, who pulled strings and manipulated events from the background, ensuring the stability of the Horde and manipulating the clans. It's the Shadow Council that fed the blood of Mannoroth to the clans, cursing the orcs but granting them demon-empowered strength. It was also the Shadow Council that contacted Medivh in Azeroth, and eventually constructed the Dark Portal between the two worlds, promising a new world for the Horde to plunder. However, during the events of the First and Second Wars, Blackhand's replacement, Orgrim Doomhammer, figured out the existence of the Shadow Council and launched an attack and annihilated most of the members of the Shadow Council, and their spirits were subsequently utilized and imbued to create the first Death Knights of the Horde. Long after the Second War has ended and the Old Horde has disbanded, members of the Shadow Council remained, and they now work in Felwood, leading members of the Old Horde (mostly the Burning Blade Clan) in a fight against Thrall's New Horde, attempting to infiltrate it. Members of the Shadow Council also survived in Outland, calling themselves the Cabal, and became antagonists in several questlines in Burning Crusade. These members of the Shadow Council continue to be a thorn in the side of the New Horde, and in Legion, the alternate-universe Gul'dan rallies members of the Shadow Council as part of the forces of the Burning Legion, but their forces are thwarted by a mighty Warlock adventurer that allied themselves with the forces of Azeroth.
The Dark Portal is the iconic portal, often depicted with two hooded statues on either side, that caused the start of the First War in Warcraft: Orcs and Humans, constructed on both sides of the worlds of Azeroth and Draenor and tying the fates of th two worlds together. Created by the possessed human mage Medivh and the warlocks of the Shadow Council, the Dark Portal allowed the orcs to arrive from their land of Draenor into Azeroth in the Black Morass. The Dark Portal remained active in both the First and Second Wars to allow the orcs to pour through, but upon the Horde's defeat in the Second War, the first Dark Portal was destroyed by the archmage Khadgar. However, the efforts of the elder orc shaman Ner'zhul, chieftain of the Shadowmoon Clan, caused another Dark Portal to be created, and allowed agents of the Horde to charge into Azeroth and steal multiple powerful artifacts. An Alliance strike-force consisting of the most prominent heroes of the Second War entered the Dark Portal and waged war against the Horde in Draenor, but Ner'zhul's schemes instead caused the energies of opening multiple portals to tear Draenor apart, turning it into the mass of multiple floating meteors in the twisting nether now known as Outland. The surviving orc clans escaped through the Dark Portal to the safety of Azeroth, and the Alliance expedition forces destroyed the Dark Portal on the Draenor side to prevent it from being used ever again.The Dark Portal was assumed to be inactive throughout the events of Warcraft III and the original World of Warcraft, but the demon Lord Kazzak used a mighty artifact to open the Dark Portal and connect it to the shattered plane of Draenor -- now Outland -- during the events of the Burning Crusade, but the warriors and adventurers of Azeroth were ready. They assembled and pushed the invading demonic forces back through the Portal and secured both sides of the Dark Portal, eventually securing contact with the missing Alliance expedition forces that were lost during the Second War, and investigating much of the world of Outland.
Unstable Felbolt is based on the Warlock ability Felbolt, which is a basic ranged ability used by the Fel Imp warlock pet.
Sword and Board originated as a passive ability for Protection-specialty warriors in Wrath of the Lich King, with effects that buff the Devastate ability, but was eventually removed in Mists of Pandaria. A different Protection Warrior ability with the same name was added to Legion, and it's an Honor Talent that passively buffs the Shield Slam and Devastate abilities.
Bladestorm first showed up in Warcraft III as the ultimate ability of the orc's Blademaster hero, causing the Blademaster to spin around in a tornado and dealing lots of damage to units around it. In World of Warcraft, Bladestorm was added in Wrath of the Lich King and has been revised multiple times over the game's history, currently available for Arms and Fury specialty warriors, where the warrior will spin around and deal mass amounts of damage to units around it. The following are original to Hearthstone: Fungal Fortunes, Glowfly Swarm, Bogbeam, Pack Tactics, Scrap Shot, Scavenger's Ingenuity, Netherwind Portal, Apexis Blast, Libram of Wisdom, Psyche Split, Bamboozle, Vivid Spores, Totemic Reflection and Corsair Cache.
