Cho'gall (tactics)

Cho'gall resides in the Throne of the Apocalypse in the Bastion of Twilight in the Twilight Highlands. He is the final boss on normal mode and the penultimate on heroic, with the final, optional boss being Lady Sinestra. He is surrounded by minions who must be dealt with before engaging the actual boss.

Adventure Guide
''Under Cho'gall's control, the orcish Twilight's Hammer clan was transformed into a murderous cult obsessed with the Old Gods and their herald, Deathwing. Extended contact with his dark master has hideously warped both Cho'gall's mind and body.''

Abilities
Cho'gall has a 10 minute enrage timer in all difficulty modes.

Many abilities in the encounter will cause Corrupted Blood. Corruption causes and amounts:
 * Dark Sickness - 5
 * Accelerated Corruption - 2 per second
 * Sprayed Corruption - 5 per 2 seconds.
 * Spilled Blood of the Old God - +5 per second of standing in it.
 * Congealed Blood of the Old God melee - 2 per hit.
 * Corrupting Crash - 10
 * Depravity - 10
 * Festering Blood - 5
 * Debilitating Beam - 2 per second.
 * Corruption of the Old God - 1 per tick.

Phase One
Take Cho'gall to a corner and have the ranged group up in the center. When Cho'gall casts conversion you will need to stun, interrupt, disorient or CC the players affected and this will be much easier in a tight group. The tanks will need to switch off for Fury of Cho'gall.

When a Corrupting Adherent spawns all DPS must switch to it. You must be careful to interrupt Depravity and move out of the way of Corrupting Crash. If you gain corruption in this phase phase two will be much harder. Make certain the Corrupting Adherent dies in a corner and that the tank and melee run out as it is dying to avoid corruption from spilled blood of the old god. The add must die before Cho'gall casts Fester Blood. If you kill it in time you will then need to snare and AoE down the Congealed Blood of the Old God. Avoid being melee'd by these as they cause corruption.

Repeat the process with the next Corrupting Adherent and make certain it dies very close to the first Adherent. This time you will have twice as much blood of the old god. The third adherent will have thrice as much blood of the old god, acting as a soft enrage.

If you are close to phasing and have an adherent spawn continue damaging Cho'gall. The adherent will despawn at 25%.

Phase Two
This phase is relatively simple, you will take more damage from the AoE pulse depending on how much Corruption you gained in the first phase. If you hit 100 Corruption you cannot be healed and will die. You will still need to swap tanks for Fury of Cho'gall.

Cho'gall will spawn Darkened Creations in this phase. It is very important to interrupt and stun these so that they do not cast Debilitating Beam, which causes corruption and effectively removes a player from the fight. The first two or three waves should be killed, after that burn Cho'gall.

Tip: Cho'gall tank should move the boss to a wall when nearing phase 2. This causes the Eyes that pop up to appear in a semi-circle as oppose to all around. This lets the DPS focus fire on each eye with interrupts and killing them.

Heroic Mode
On 25-player Heroic Mode, two Corrupting Adherents will spawn at a time, which must both be killed. In addition, double the normal amount of blood will spawn during Fester Blood.

Shadow Lords and Fire Elementals will appear on Flame and Shadow's Orders that must be damaged to reduce Cho'gall's stacks of their buff.

In Phase 2, Spiked Tentacles will appear in addition to darkened creations. The raid should move away from them (as they will knock players back) and simply ignore them, as they have too much HP to efficiently kill.

Solo strategy
Pop CDs and blow him up. Don't use any abilities that summon guardians, like Mirror Image, or Conversion casts will charm the player, resetting the encounter. Just focus on the boss and burn down his health as quickly as possible.

Related achievements

 * The Bastion of Twilight (achievement)
 * The Bastion of Twilight Guild Run
 * Heroic: Cho'gall
 * Heroic: Cho'gall Guild Run
 * The Abyss Will Gaze Back Into You

Quotes
A denotes Gall speaking, while regular text is Cho speaking. In addition to the quotes during his fight, he will say things at various points throughout the instance, such as when Halfus Wyrmbreaker dies.


 * Intro
 * yell


 * Aggro
 * yell


 * Conversion
 * yell
 * yell
 * yell
 * yell


 * Summon Corrupting Adherent
 * yell
 * yell
 * yell
 * yell
 * yell


 * Phase 2
 * yell


 * Darkened Creations
 * yell
 * yell
 * yell
 * yell
 * yell


 * Killing a player
 * emote
 * yell
 * yell
 * yell
 * yell
 * yell
 * yell
 * yell


 * Raid wipes
 * yell


 * Death on Normal
 * yell


 * Death on Heroic
 * yell


 * Unused quotes
 * I call upon the realm of fire!
 * Realm of water, give me strength!
 * The strength of the wind will be mine!
 * The forces of earth will demolish you!

Trivia

 * The "Stop. Hammertime!" quote is a reference to the popular song "U Can't Touch This" by MC Hammer.
 * World first heroic kill on 25-man achieved 15.1.2011 by For the Horde of Nazjatar Europe.