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The Mantellan Crux is a small, self-contained world located in Aetherius that served as the prison of the Mantella after it was blasted from Mundus by Zurin Arctus. It is designed as a giant puzzle to test those who would seek the heart of Numidium, and is inhabited by fearsome Daedra and undead. The Blind God, a giant skull, dwells here. The Agent retrieved the Mantella from here in 3E 417, just prior to the event known as the Warp in the West.