History ThatOneBoss / WorldofWarcraft

** Meanwhile, all the while you're directing your Pit Lord around the battlefield, keeping an eye on Kanrethad's nuke timers and a finger on the interrupt button, being ready to bolt for cover on a dime, pumping out massive AOE damage to kill the literally dozens of imps, pumping out massive burst damage to kill the felhunters before they can free your pit lord, cleansing yourself of the DoT, and being fast as a snake on the target switching and various crowd control mechanics, you have to manage, you ALSO have to maintain an extremely high output of DPS on Kanrethad himself, because if you don't kill him within a certain time frame, you automatically die from his Curse of Doom spell.

* Cenarius is easily the most difficult boss of the Emerald Nightmare, simply because of the sheer amount of mechanics that need to be addressed. If a Twisted Sister gets off too many casts of Scorned Touch, you die. If a dragon gets off too many AOE casts, you die. If you're not paying attention to your Nightmare Corruption and don't get into the green pools before the damage become unhealable, you die. If you don't have the DPS and the kiting skills to kill the boss in Phase 3 when he starts covering the entire arena in a deadly void zone, you die. If not enough Brambles are cleared, you'll die as your entire raid gets caught in them while dealing with everything else.

** Hymdall is mostly an awareness check. His Bloodletting Sweep will likely oneshot any non-tank players who find themselves in front of him, and his Storm Breath will certainly oneshot non-tanks. In addition to this, his Horn of Valor deals high aoe damage to all players, and standing in his whirling blade will kill you in seconds.
** Hyrja is likely the most dangerous boss in Halls of Valor. Her Eye of the Storm and Arcing Bolt abilities are gradually empowered the longer she stays on the left side of the room, and her Sanctify and Expel Light increase in damage in the same way the longer she stays on the right side. Eye of the Storm deals aoe damage over time for around 5 seconds, and she immediately follows it up with an Arcing Bolt which can easily finish off players that haven't been kept topped off.

** Talixae Flamewreath is dangerous for two reasons; [[FlunkyBoss the imp adds she continuously spawns]] and the ever increasing aoe damage she puts out. The former is likely to cause more danger if you lack the CC, damage, or both required to deal with them safely.

** [[WolfpackBoss Moroes fights alongside his dinner quests]], who all have a variety of dangerous abilities, such as a spinning axe that deals strong aoe damage to those too close, a mana drain that stuns your healer and depletes them entirely of mana if the whole cast goes through, and a frontal aoe that comes fast and has the potential to oneshot. The catch is that these dinner guests can be CC'ed before pulling Moroes, and can be CC'ed until Moroes reaches 60% and frees them. Therefore, the key to defeating him is to CC his guests and deal with them in a controlled fashion. Don't take too long however; Moroes periodically applies stacks of Garrote on random players, which causes them to take bleed damage for the rest of the encounter.
** Harbaron can be difficult on a similar vein to Hymdall - the majority of deaths will be from his [[SinisterScythe scythe attack]] that becomes lethal at higher keystone levels. It becomes a hectic fight when you also have to deal with his adds - one of which who will aoe the whole group if not interrupted, and the Fragments that stun and deal high single target damage to a player.
** Shade of Medivh requires a mix of high dps, high healing and excellent coordination on higher keystone levels. Frostbite hits players hard and keeps them stunned until another player gets target by Inferno Bolt and gets them hit by it too. Inferno Bolt itself deals fairly high damage overtime, and Piercing Missiles hits the tank hard and if fully channelled, causes the tank to take additional damage from the next cast. Even more dangerous are his three ultimate abilities; Flame Wreath targets two players and places a ring around them. These players take high damage for 20 seconds, and [[ExplosiveStupidity accidentally stepping outside the ring instantly kills the group.]] Ceaseless Winter will make quick work of players unless they keep moving, and Guardian's Image summons three arcane birds that deal increasing aoe damage to all group members until killed. The difficulty of this boss can greatly fluctuate based on the amount of interrupts you have, your group composition, and luck.

*** The last boss, L'ura, begins the fight by shielding itself and having a single Rift Warden fight the group. These adds spawn Fragments of Despair, which must be stood in by at least one player or the whole group explodes. Killing the Rift Warden gives the group a chance to attack L'ura, who drops the shield and takes increased damage for around 10 seconds. Afterwards, two Rift Wardens spawn and the group must defeat them to progress into phase 2. In phase 2, L'ura becomes active, and the main danger of the fight becomes the ever increasing aoe damage the group constantly takes. With grievous and tyrannical, this phase can be incredibly taxing for healers.

* Antorus, The Burning Throne contains quite possibly the most annoying and mechanic-strict boss fight in a while - the Coven of Shivarra. Not only it requires tanks to switch between two bosses every several seconds so they can actually be damaged, the bosses also have several annoying abilities, including some devastating AoE attacks, a debuff that will freeze you if you don't heal it over and a near-instant death move. The worst part about the fight are the Titans, being forced to use their power against you. Khazgaroth will quickly kill people who don't move away from his flames, Golganeth wipes groups who stand to close to each other, Norgannon can insta-kill anyone who comes near his spectral images and Aman'thul applies an increasing DoT if you don't kill his images fast enough. Groups usually keep their Bloodlust for that particular moment to avoid stacking damage too high, but this fight requires massive amounts of coordination to defeat.

* De Other Side in terms of bosses, have Hakkar and Dealer Xy'era. Even on non-tyrannical weeks, this bosses are basically the roadblocks of the whole dungeon. Xy'era is a massive healer strain and high-damage boss, to the point he got some hefty nerfs and is still a pretty unforgiving boss in general and a pretty gruelling one whenever grievous affix is active. And lets not start with Hakkar, which is known as the real roadblock/run killer of the dungeon for a very good reason. Hakkar summons snakes and will regulary summon more as the fight goes on, and each time he hits 100 energy, he deals large AOE damage to the whole group and gains a damage absorb that grows bigger if he successfully dealt damage with the 100 energy AOE ''all while he is busy doing his mechanics and gainin energy to re-do the AOE again''. It's a fight that pretty much boils down to "Have a comp with good damage-reduction/absorbs/inmunities, burn Hakkar down and pray you kill him before adds overwhelm you or you take too long. It's entirely possible if you run the wrong comp or you allow a new shield to happen before you broke old one (which can totally happen if your comp lacks the tools to deal with the adds, who detonates and add up to his already large shield if they live when Hakkar hits 100 energy, or don't have a way to keep the shield absorb low by reducing/negating AOE damage) to fail the timer of the dungeon. He is one of the very few dungeon bosses in the whole game to effectively demand a strict comp and punish you if you don't burn him fast enough.

* Raszagath is both ThatOneBoss and the BestBossEver for the fact that even on the lowest tier(s) of difficulty, a few players can ''easily'' screw over the ''entire'' raid. Tanks have to constantly juggle her aggro with each other and she can instantly blow you off the arena. If players aren't able to position an attack that places a hazard (which will keep them from flying off) in the right place, everyone will go ''flying''. What's more, she will do this multiple times and even start using a breath attack during a [[FlunkyBoss flunky stage]] where there's almost no particle effects on the floor until it's too late and the player's already dead.

* Netherspite (technically a BonusBoss, although this could be said of at least half the bosses in Karazhan), is of the "one stupid mistake can wipe the raid" variety. His mechanics require rotating players through a series of beams, a mistake with any one of which can result in the wrong person tanking or taking damage and completely wreck the plan.

'''REMINDER''': Hard modes, being optional, count as {{Bonus Boss}}es.

*** [[WolfpackBoss Saprish fights alongside his pets, Shadewing and Darkfang]]. Shadewing periodically leaps to the furthest player and attempts to cast [[MakeMeWannaShout Dread Screech]], which disorientates all players and can quickly lead to a wipe if not interrupted. Saprish himself places traps all over the floor, which can be difficult see. This fight gets even worse if Necrotic is the level 2 affix, as it can make dropping stacks for the tank extremely difficult.

* Warbringer O'mrogg in Shattered Halls is a two-headed ogre that occasionally chooses to attack a random player other than the tank, and can't be taunted. Bring a bunch of cloth-wearers in there and prepare to get squished.

*** [[WolfpackBoss Saprish fights alongside his pets, Shadewing and Darkfang]]. Shadewing periodically leaps to the furthest player and attempts to cast [[MakeMeWannaShout Dread Screech]], which disorientates all players and can quickly lead to a wipe if not interrupted. Saprish himself places traps all over the floor, which can be difficult see. This fight is [[UptoEleven turned up to 11]] if Necrotic is the level 2 affix, as it can make dropping stacks for the tank extremely difficult.

* The Nighthold. Mythic. Gul'dan. [[ArcWords You are]] [[YouAreNotReady not prepared]]. To start, Gul'dan begins the encounter in his empowered "second phase" form, [[IncreasinglyLethalEnemy and it only gets worse from there]]. His attacks [[UpToEleven hit harder, more frequently]], and the margin for any error becomes razor thin. Twice during the encounter, he uses a wind attack designed to [[BlowYouAway sweep inattentive raiders clear off the platform]], out of reach of any resurrection spells. Cooperation between all parties involved is paramount, because if too many raiders die before [[spoiler:the hidden phase]], failure is all but assured. At a tenth of Gul'dan's remaining health, Archmage Khadgar attempts to [[spoiler:return Illidan Stormrage's soul to his currently vacant imprisoned body.]] [[NiceJobBreakingItHero It doesn't work.]] The raid then has a limited amount of time to finish off Gul'dan before [[spoiler:[[TrueFinalBoss The Demon Within]] becomes active]]; an unforgiving encounter featuring at least one attack that [[TotalPartyKill guarantees a raid wipe 100% of the time]] should the raid miss the crucial moment necessary to avoid the damage. All this while having to deal with the constant threat of [[ChestBurster shadow parasites]].

* Devourer of Souls in the Forge of Souls is another recent addition that can be a nasty surprise for players used to the relatively easy launch dungeons. He has a hard hitting, fast spell that should be interrupted as often as possible, hard to see area effects and several nasty special abilities that require the whole group to react accordingly. One of them almost always kills the player it aims for, but fortunately its usually only used once at low health. Groups often die to Mirrored Soul, which results in the person being targeted taking damage when the Devourer of Souls does; if the healer dies, the rest of the group soon follows.

* Lord Godfrey is only moderately difficult as a Heroic boss at level 85, but when players go through normal Shadowfang Keep in their late teens and 20s, his abilities (summoning adds, placing a DOT on random people with Cursed Bullet, and a frontal cone [=AoE=] that almost certainly kills those standing in it) are considerably more complex than most other boss fights around that level, even compared to many of the other new bosses in Deadmines and Shadowfang Keep, who do not have their most deadly abilities in Normal. Cursed Bullet is especially difficult, since your party will likely be unable to interrupt or remove the curse like a level 85 group can.

* Oondasta, one of the new world bosses, seems to be designed to be That One Boss by Blizzard. Not only does he have a tank swap mechanic combined with an immunity to taunt, a Frill Blast that kills non-tanks, a chain-lightning Spiritfire Beam that kills its victims after the first few hits, and a devastating raid wide [=AoE=] Piercing Roar, but he also has a soft enrage mechanic that gradually increases his damage. Graveyard zerging only gets you so far when eventually, even Piercing Roar can one-shot you. Relatively soon after he came out, Blizzard decided to ''cut his health in half'', but even so, he still typically requires ''multiple full raid groups'' to defeat.

* De Other Side in terms of bosses, have Hakkar and Dealer Xy'era. Even on non-tyrannical weeks, this bosses are basically the roadblocks of the whole dungeon. Xy'era is a massive healer strain and high-damage boss, to the point he got some hefty nerfs and is still a pretty unforgiving boss in general and a pretty gruelling one whenever grievous affix is active. And lets not start with Hakkar, which is known as the real roadblock/run killer of the dungeon for a very good reason. Hakkar summons snakes and will regulary summon more as the fight goes on, and each time he hits 100 energy, he deals large AOE damage to the whole group and gains a damage absorb that grows bigger if he successfully dealt damage with the 100 energy AOE ''all while he is busy doing his mechanics and againin energy to re-do the shield mechanic again''. It's a fight that pretty much boils down to "Have a comp with good damage-reduction/absorbs/inmunities, burn Hakkar down and pray you kill him before adds overwhelm you or you take too long. It's entirely possible if you run the wrong comp or you allow a new shield to happen before you broke old one (which can totally happen if your comp lacks the tools to deal with the adds, who detonates and add up to his already large shield if they live when Hakkar hits 100 energy, or don't have a way to keep the shield absorb low by reducing/negating AOE damage) to fail the timer of the dungeon. He is one of the very few dungeon bosses in the whole game to effectively demand a strict comp and punish you if you don't burn him fast enough.

** Really, the entire of Sanguine Depths could quality if we speak about the bosses. Kryxis is a pretty crude Tankbuster(High tank damage) and a nightmare to heal when the orb phase starts, as it requires soaking to prevent boss from healing, while each soak done deals a LOT of group damage. Inquisitor can potentially melt a player in seconds on tyrannical weeks with his castigate casts, which targets a random player and deals a high amount of burst damage over several seconds, so much that its advised to bring a hunter purely to abuse feing death to interrupt castigate chanel(and thus negate the damage entirely) and spare some mana from healer.

* De Other Side in terms of bosses, have Hakkar and Dealer Xy'era. Even on non-tyrannical weeks, this bosses are basically the roadblocks of the whole dungeon. Xy'era is a massive healer strain and high-damage boss, to the point he got some hefty nerfs and is still a pretty unforgiving boss in general and a pretty gruelling one whenever grievous affix is active. And lets not start with Hakkar, which is known as the real roadblock/run killer of the dungeon for a very good reason. Hakkar summons snakes and will regulary summon more as the fight goes on, and each time he hits 100 energy, he deals large AOE damage to the whole group and gains a damage absorb that grows bigger if he successfully dealt damage with the 100 energy AOE ''all while he is busy doing his mechanics and againin energy to re-do the shield mechanic again''. It's a fight that pretty much boils down to "Have a comp with good damage-reduction/absorbs/inmunities, burn Hakkar down and pray you kill him before adds overwhelm you or you take too long. It's entirely possible if you run the wrong comp or you allow a new shield to happen before you broke old one (which can totally happen if your comp lacks the tools to deal with the adds, who detonates and add up to his already large shield if they live when Hakkar hits 100 energy, or don't have a way to keep the shield absorb low by reducing/negating AOE damage) to fail the timer of the dungeon. He is one of the very few dungeon bosses in the whole game who to effectively demand a strict comp and punish you if you don't burn him fast enough.

* Zul, Reborn is probably the most difficult boss in Uldum apart from G'huun. He has multiple types of adds, voidzones and even a dispellable debuff that will cause players to walk toward the edge and throw themselves off.