Den of Flame



The Den of Flame is an area in Dustwallow Marsh, just west of the Stonemaul Ruins that has been completely overrun by dragonkin of the black dragonflight, presumably under the orders of the great black dragon Onyxia, who resides nearby. The structure was built by the Stonemaul ogres to be their ogre mound, as the architecture in the area corroborates, and as such it still contains the Stonemaul Banner required by Banner of the Stonemaul.

Speculation
The outdoor area of the den could be the place where Rexxar fought Kor'gall.