The Death's Head mask was a face mask worn throughout several eras by Mortanius, the Guardian of the Pillar of Death. It was alabaster-white, and seemed to alter the contours of its wearer's face, giving him a gaunt, skeletal visage. The mask sported no eye slots, with only black, empty sockets in their place.
Throughout all of his interfaces with Kain during Blood Omen: Legacy of Kain, Mortanius wore the Death's Head mask, concealing his face. He had also worn it centuries earlier in Avernus Cathedral, when condemning Malek for his failure to defend the Circle of Nine from Vorador.[Blood Omen] Mortanius could easily summon and dismiss the mask through magical means.[1]