My 10man raid has been working on Heroic Thok for about 2 weeks now. After quite a bit of trial and error, we're able to make it through the first phase and first kite phase pretty consistent. We open the poison door first. We completely hit a wall though during the second stack phase whenever bats come out, though. Incoming damage just goes through the roof and I feel like the healers just fall apart.
Comp. We currently 1 tank, 3 heal, 6 DPS
DPS Warrior (OS, Prot MS)
Holy Paladin (Ret OS)
BM Hunter (me)
For the first phase, we form a triangle on the boss's side. One group is the Warrior, Monk, Paladin, and DK. The second group is the Mage, Lock, Shaman, and Priest. I'm alone at the third point. When we reach 18 stacks, I move between the other two groups and we usually end up phasing around 22-23 stacks. For the first kite phase, we kite Thok across the middle of the room two times, then down the hall once, then to the back of the room near where he spawns. We open the Poison door second. Thok being at the back of the room when he fixates to the poison door lets us transition to the second stack phase seamlessly.
This is where we have problems. Everyone stacks on the boss's side as a single group. The bats come in, and our Frost DK gets aggro and holds them in the group and we try to stun and burn them down the best we can. Incoming damage during this phase seems to be ludicrous though, and we end up dying every time. We just can't seem to survive once the bats are out.
Here are logs from our attempts. I know the Shaman's DPS is low; we're working on it.
I'm kinda at a loss at how to fix the situation. I'm open to any/all ideas.