Tomb of Horrors

The Tomb of Horrors was a dungeon built by Acererak in order to lure adventurers to their dooms and feed their souls to his phylactery.

History
Built during the Age of Empires, the Tomb of Horrors was one of the first of many dungeons Acererak would design across the multiverse. Over the centuries, many adventurers, enticed by Acererak's treasure were slain by the Tomb's puzzles and traps, supplying the lich with sustenance, while he drifted through the planes as a disembodied consciousness. The countless deaths within the tomb created a gateway to the cursed city of Moil within its crypt. Moil, a city cursed by Orcus himself, was permeated with strong ties to the negative energy plane. Acererak, who had developed an interest in the powers of negative energy, chose to build his fortress within the cursed city. It was from this fortress, in the year 489, that he planned to ascend to godhood. Although his attempt at apotheosis came perilously close to success, it was foiled by a group of adventurers, whose names are now lost to the ages (and whose last descendants were all slain long ago by Acererak). After Acererak's defeat, the gate to Moil was sealed, although the lich returned to the Tomb and reset its traps, allowing it to continue to serve its original purpose.