Tumulus, to many on earth in the cal leandros series as Hell, the Auphe-Hell, or, to the auphe, simply home. it is a place beyond decription by words, the human mind will often block out visitation to this world in an fugue state. It's hard to believe anyone could survive living in such a place, which is one of the many reasons that the auphe are such efficient, and violent hunters.
Not much is known about tumulus (excluding Cal and Niko's 15 minute venture) other than that the world is covered in a glass like substance. the air is foul, as the world presumably lacks an atmosphere. many of the most horific mosters in the world fear this place, trembling at the very mention; and even more fear is struck the pale, bloodthirsty creatures that live there.