Daylight hurts him but not any other sort of light at first. Later on he becomes weaker in the presence of ALL lights because the game was so awesome they ported its concepts into the comic (yes, really).
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Currently playing: League of Legends, Chrono Cross.
Current Projects: Fool's Overture, CYOA: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60143513