Development Hell is a dungeon that spawns in the Cemetery of the Forsaken in place of a Defiled Crypt location. In it you will find that every enemy is named after a Diablo 3 game developer. For example, one elite mob that spawns is Jay Wilson, the lead game director for Diablo III. It will only spawn in Nightmare, Hell, or Inferno difficulty. You receive a Feat of Strength and a unique sigil for your banner for killing him.