The Fall of Bolg Thagar

The darkness creeps its way into the heart of this place. It seeps out of the very ground you're standin' on. Take the old bear, Thag Bolgar. The dark taint worked its evil on him and now he's a shamblin' monstrosity. Many a Slayer has met his end in battle against that beast. Ah, I can tell by that look in your eye you've got an itch to try your luck against old Thag Bolgar. Well, I'm not goin' to talk you out of it if that's what you're thinkin'. It'd be an act o' mercy to put that poor beast down. If you still want to hunt for old Thag, I know someone that can maybe give you an edge in the fight. He's a friend o' mine and he's been havin' a rough time with some Beastmen. Head east to the shrine of Grimnir and speak to Acolyte Bronzebanner.

Search for the Shrine of Grimnir in Stonefoot Ridge east of Kazad Gromar. Speak with Acolyte Bronzebanner.