We had Whelps, Slate Dragon, and Nether Scion

Group comp was:

Tanks:
Protection Warrior
Protection Paladin

Healers:
Restoration Shaman
Holy Priest
Holy Paladin

DPS:
Shadow Priest
Demonology Warlock
Survival Hunter
Feral Druid
Enhancement Shaman

Killed them in this order

Nether Scion, Slate Dragon, Whelps(was only being touched by the prot warrior)

Got him down after only 2 wipes.