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 2 phases: ground phase and air phase. You start in the ground phase and then after a set time air phase happens, and a set time later she returns to ground phase, and so it continues til you kill her. Throughout the fight there will be fire on the ground, just navigate around it.
In the ground phase she has 4 main mechanics. The first is called artillery and is a tank mechanic. She’ll put it on her focus target, and when it drops off it does huge damage in a 30 or 40 yard range. It can go on more than one target at a time, but only one target will explode at a time, so tanks should always be able to run away with theirs before it drops off. The second is called barrage, where she faces the direction of a random healer, leans back, puts her arm up in front of her chest, and then does an enormous cone in front of it. Just make sure you’re not too far from her so you can move to her side or back in time. The third mechanic is called blitz, where she faces the direction of a random player, leans forward, and then charges across the room, hitting anyone in her path. She’ll do this twice, so the second charge usually brings her back to the raid. It’s kinda a pain to figure out how to be out of her path, but if you do get hit just pop a defensive and you should be ok. The last main mechanic is pounding, which is just raid damage for the healers to pad with cds on. One extra thing if you wanna be pro is that random players will do splash damage, but that’s just a make sure your range meter is clear kinda thing, if you can.
In the air phase she flies around and drops strips of fire on the ground that you just stay out of. After they’re dropped you can move through them, but try not to walk over the actual splotches of fire. She also drops bombs on the ground that you have to kill otherwise they’ll kill you. The room is large the bombs are spaced out, it’s easy to not realize one’s up til you wipe. And lastly, she does artillery on 3 random raid members at a time, just run far away and pop a defensive, and try to avoid fire when you run back. When she comes back down there will be a huge circle that you have to stay out of or else you’ll be smashed. Then you’re back to ground phase again and you can kill her.
So ground phase: avoid standing where she’s facing when she does barrage and blitz. Air phase: kill bombs, run artillery away before the debuff drops and you explode. And kill stuff, heal stuff, stay alive, win.