Defeat Rokdar the Sundered Lord. Should you win, speak with Wodin the Troll-Servant to collect your reward.
This fight is gonna be painful, [player]. Do you have any friends that are brave enough to help you out? The ogres managed to get a giant from Blade's Edge named Rokdar! Trust me, you're gonna need friends, he seems unbeatable! He's hard as a rock - literally!
If you still want to fight him, step into the Ring of Blood and he will come.