The Crystal of Kadavus is an enchanted crystal fashioned in the shape of a skull. It is one of the many artifacts kept in the custody of Doctor Stephen Strange. At one time, the rival sorcerer Xandu ensorcelled Spider-Man and had him steal the crystal from Doctor Strange so that he could focus cosmic energies through the crystal and into the Wand of Watoomb, reenergizing it. The crystal was recovered and returned to Doctor Strange's collection.[1]

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