Development Hell is a secert area in the game. During the "A Shattered Crown" quest in Act I on the Nightmare or harder difficulty, select the part where you have to open the gate. Go to the Cemetery Of The Forsaken and check all the crypt names. There are three areas named Defiled Crypt you can enter, one of which has the quest goal. When you enter one of the crypts, there is a random chance it will instead take you to Development Hell. If none of the crypts take you to Development Hell, save and quit the game. Restart the saved game and repeat this process until one of the crypts are Development Hell. In Development Hell, the normal Risen Dead enemies are named after the Diablo III development team, with their descriptions being their job title. The game director, Jay Wilson, is an elite monster, and killing him grants the hidden Feat Of Strength achievement "Smash! Jay, Smash!" along with a Banner Sigil.