Hellfire Council

Link to Video: https://www.youtube.com/watch?v=4JzMdaV8_Bs

Breakdown:

3 Boss fight. 2 bosses tanked on top of each other. 1 tanked over 25 yards away. Separate health pools.

Dia Darkwhisper: Makes other bosses within 25 yards of her immune to damage.
Nightmare Visage: Transforms and just does high tank damage during the short duration.
Mark of the Necromancer: A dot placed on a random player which ramps up damage. When dispelled, jumps to 2 other players and ramp damage is reset and begins again.
Reap: Removes all Mark of the Necromancers and spawns a void pool under those players. Players with marks need to move to edge of room before the cast ends.
Wailing Horror: Light ticking damage to entire room and ghosts spawn at the edges and fly through the room doing AOE damage in their path.

Blademaster Jubei’thos:
Fel Blade: Throws his sword in a targeted direction which flies out then returns along the same path. Arrow indicates direction of the throw. AVOID.
Felstorm: Deals fire damage to the entire raid. May need healing CDs
Windwalk: Splits into multiple copies of himself and each one either spams Felstorm or Fel Blade. Kill these off quickly and the boss then returns to his normal form.

Gurtogg Bloodboil:
Bloodboil: Deals ticking damage to the 5 furthest players from him. Not much to worry about if tuned the same as PTR
Acidic Wound: Tank debuff. Not really able to tank swap so watch out for it. Following ability will help reset stacks
Fel Rage: Focuses a non tank target and attacks them. The target will gain increased defensive stats and can be CD’d HoP’d etc to reduce damage. Towards the end of the cast, the fixate will want to drag boss away from the tank so his stacks can reset while the boss runs back to him.

30% phase:
All bosses become more deadly! Need to kill in an order and keep the other two above 30% while you kill each one.

Bloodboil: reduces max health of the raid by 10% slowly increasing in power. Simple ability. Kill him first and fast.
Blademaster: Deals unavoidable damage to half the raid which stacks in power even after he dies. Kill him second.
Darkwhisper: Loses “Reap” ability. So all Mark of the Necromancer debuffs will never be removed. Also puts Marks on about half of the raid. Nuke her down fast while dispelling debuffs when needed.