Ok I have ventured into the Abyss and I think I have been to one or more of these areas in that I have killed one or two mobs with [Renowned] after their names. However, how many are there and what are the mechanics of these spawns? Is there an alter? Is the Renowned guy the boss? how many waves? Is there some artifact drop chance? Some other reason to do them? I dont remember anything much dropping off the renowned guy.