Hephesimereth is nothing, quite literally. It imbues creation with defeat, emptiness, loss and despair. Particularly pessimistic mages believe that eventually every decan will wind up in the sack of Aniel.
Aethyr: Aniel, Lord of Defeat, walks with his head down and his dark red, shapeless, hooded robe over him. Only his hands emerge from the drapery, holding an empty sack.