Onyxia

[Bastet]

Special Attacks:
Everything from Phase 1.
The cracks in the floor shoot lava every 20-30 seconds fearing everyone near the crack which usually sends them running through other lava cracks for a good 1500 damage. The fear isn't dispelable and fear ward doesn't work. Solution: Stay off and away from the cracks. Hug the wall. When you get feared, immediately get back into position. Mithril Insignia works for anti-fear but switching stances to break fear is dubious at best for the MT.
If you are moving forward and backwards rapidly while meleeing you will not run around when you're feared, you'll stand in one place feared. Anyone who can should be rapidly moving forward/backward to avoid being feared through lava

Phase 3

The positioning is the same as phase 1 but much tighter due to the exploding lava cracks. Remember, it's now okay to bunch together again so cluster up and stay off the cracks. Melee stay as far away as you can off the cracks. Ranged people hug the wall away from the cracks.

Be careful not to get too far in front of her along the wall. The MT will slowly be moving her north, don't go too far north and get hit by the fire breath. Keep your back away from the eggs incase you are knocked back.

Whelp groups get a break because there are very few whelp spawns as long as no one gets knocked into the eggs just like phase 1. They need to be positioned further away from the eggs so they aren't feared into them. Near the leftmost/rightmost R spots on the above map.

Big dragon lands, MT is waiting under her with rage, slaps her in the face, and questions her mother's sexual orientation. Nobody else is attacking and the MT has agro.

MT moves to the phase 1 position but mindful of cracks in the floor now.

It's likely that the MT will get feared and lose agro before he's in position. Assuming the MT has enough agro she will chase him around while he's feared. If she doesn't, #2 on her agro list is promised a swift death. If she fire breaths a bunched up side while the MT doesn't have agro the run is over.

The MT is going to lose agro more than once because he gets feared, teleported, knocked around, and downright violated by her special attacks. Stop attacking, get ready to move to avoid fire breaths/eggs, and move back into position for attacks when she is back on the MT pointed north.

Beyond the floor exploding with lava, being feared into the lava, the MT losing agro or changing positioning often, and everyone being very low on survivability, this is exactly like phase 1. Mind your DPS and position. Deal with the whelps. Let the MT tank and keep him alive at all costs. If the MT dies even at 5% the raid is over.

Anything that can do damage should be focused on balancing DPS and surviving. Anyone that can heal should be healing the MT. If your priests say the MT is under control backup healers should be keeping DPS alive.

At around 5% her damage output will go up noticeably (by 25-30% I'd guess) and pretty much everyone in the raid who can heal should be spamming their fastest ones on the MT. Like I said, if the MT dies at any point the run is almost certainly over.