The Forked Pyre in Avernus is the mighty iron fortress of Duke Furcas. The fortress is built upon a powerful cascade of roaring lava. One of its three spiked black towers houses the burning armories of the Duke, the second the barracks of Duke's 20 legions and the third a dungeon packed with tormented rivals and useful souls. On an island upon the lava flow at the heart of the duke's palace rests the six-eyed, hellmouth called Gissiclis, its bowels stretching to the Garden of Heresies in Dis.
For additional resources, see the Meta page.