Occupied Ruins is one of the randomly spawning dungeons in Battlefields of Eternity in Diablo III. Inside, one of the two events will always occur. The dungeon is very small, and consists of three platforms connected by short bridges, essentially the whole zone is a single corridor. It is, however, interesting visually: corpses of ancient demon lords can be seen in the background, stored in niches in the walls, and the space below is presumed to be filled with some sort of tombs. It may be a demon vault of some kind, or even a crypt.