Cho'Gall

Cho'Gall is the final boss of the 25 man raid instance Thunderaxe Fortress

The Forgotten Isles
When the Alliance and Horde landed at the Forgotten Isles they were quickly attacked by a mad and militaristic troll tribe. They had been fighting a losing war against Cortexius until being brainwashed by a new mysterious leader. It is later revealed in Akua'Ket Temple that this leader is Cho'Gall.