Diablo Wiki

Ghost Prison is a minor event that may occur on a Greyhollow Island in Adventure Mode of Diablo III.

Either Ghost Prison or Binding Evil event will always appear in every game.

The Nephalem may occasionally find The Crazed Man tending to gruesome bone totems. If the hero touches (and destroys) the Pillar of Cupidity, which is the central totem, The Crazed Man will attack, together with a horde of Shipwrecked Souls unleashed from the totems.

The event ends when all of them are dead, awarding gold and experience.