Stark wears a half-mask - strapped to his head by two separate buckles - of an unidentified metal, covering an incorporeal area that glows dark orange when uncovered, on the right side of his face (roughly his eye and cheek-bone) that he only reveals when he is taking away someone's pain or "crossing over" a soul—aiding or comforting a person in the moments prior to their death. However, in doing so, Stark absorbs a small fragment of the soul - and thus the knowledge and lingering emotions - of the person he "crosses over" into his own psyche, something which might explain his somewhat unbalanced mental behaviour (although his undergoing months of torture may have even more to do with it). In addition, by virtue of being a Stykera, Stark can ease the pain and suffering of others, one of the traits that made him sought after for Scorpius' Aurora Chair research.