This quest is not available in game.
Retrieve the Stonemaul Banner and bring it to Brogg at Mudsprocket.
When the dragons came and took over Brogg's old home, Stonemaul ogres fled and left everything behind, including clan's banner.
Brogg knows banner was kept deep in Stonemaul ogre mound, but these days it's called Den of Flame. Brogg must have clan banner to get his revenge on dragons who killed his friends.
Brogg's clan's old mound, Den of Flame, is northwest of Mudsprocket and crawling with dragonkin. Banner will be deep inside the cave. Be careful, <name>.