This is a sacrifice pit from the evil times of Adrihol, now known as Shadar Logoth. Built and used in the beginning of the corruption and suspicion that eventually destroyed Ahrihol, the ever suspicious residents of the city would cast those who they did not approve of into the pit. This is considered to be the birthplace of Mashadar, and the place where the city began to deteriorate. Originally a test level for my Mashadar Tutorial. Thus the Mashadar when you first enter the game. Just kept building, and decided to make it an arena level.