The Black Rest

At the foot of the Ebon Mountain lies the crypt containing the bodies the many Demon Lords to have ever existed, with few exceptions. From the great Vartos the Vanguard, to Epiphania The Betrayed, to the latest of the departed. These legendary rulers and warriors are interred for posterity within these hallowed grounds. The crypt wasn't formed from a specific religion, but out of sheer respect for paragons of the Demon race as a whole.