I’m gonna assume you know the basics of raiding, and this is just to help you get a jump start on the Hellfire Citadel raid.

This fight has 3 bosses: Bloodboil, Jubei’thos, and Dia. Dia shields the other two when she gets in 25 yards of them, so you have to tank her apart or kill her first. They each do different mechanics.

Bloodboil puts a bloodboil dot on the 5 farthest players that I don’t really notice on heroic. He also does fel rage on a random non-tank raid member where he fixates them, and they get to do like 200% damage to him. Healers need to watch this person, and this person needs to make sure he’s far from Dia so the shield doesn’t stop them from doing pretty damage numbers to him. After awhile he does an ability that makes him leap from one spot to another in the room, doing damage to anyone near his landing spot. These spots are telegraphed by earthy swirly animations on the ground, so they’re easy to stay away from. When Bloodboil goes below 30% health, he puts debuffs on people that lowers their max health, and this stacks. It goes away after he dies though.

Jubei’thos whirls around sometimes and does raid damage. He also does fel blade where a boomerang gets shot out in the direction of an arrow on the ground and then comes back. Just stay out of that arrow until you see the blade come back and you’ll be fine. After awhile he does mirror images, where he disappears and splits into images all around that do the same thing he does. Just watch the arrows and kill them, cuz killing them also hurts jubei’thos himself. When he goes below 30% health, he does wicked strikes which is sudden aoe damage to half the raid every once in awhile, and this continues even after he dies.

Dia does a tank hit called void bolt that does pretty big damage. She also puts a dot on a few people called mark of the necromancer that ticks harder the longer it stays on a person. It can be dispelled, but once it does it jumps to someone else. The only way for it to fall off is when she casts reap, then it falls off in the form of a void zone about 5 yards in radius, that damages anyone standing in it. So avoid dispelling if it’s healable, and when reap happens run away from the raid if you have the mark to drop your zones out of the way. After awhile she’ll do these ghost things that fly across the room over people’s heads. Try not to be under these ghosts cuz they do a good amount of damage if they fly over you. When Dia goes below 30% health she stops doing reap and applies her dot to half the raid, so from then on it’s rough for healers.

On heroic it’s basically drop your mark of the necromancer away during reap, keep Bloodboil and Jubei’thos away from Dia (especially if you get fel rage), and watch out for the arrows (the blades) and the ghosts during the ghost phase. Also watch out for wicked strikes after jubei’thos goes low health, it hurts. Everything else is simple don’t stand in bad and kill whatever you can kill or whoever your raid leader wants you to prioritize. Most groups do do Bloodboil > Jubei’thos > Dia.