Do you even play a healer??? Or are just you looking for 10 clerics and 1 warchanter bard to carry you through your "epic" Shroud?Suulomades.. Epic Suulomades.
At 5% health he will teleport away and send waves upon waves of epic detanator bats at you. These can't be killed, they just suicide asplod on your face. So if your healers aren't prepared, you all die. But if they are, you heal thru and he comes back down for the final battle. For the last bit he casts his chain abliity almost continuously.