Masks

Boss Masks are vanity items dropped by all non-event bosses, and also from the bosses. They are worn in the social head slot. Each boss has a 14.29% (1 in 7) chance to drop its own mask.

Trivia

 * Although most event bosses (e.g. Ice Queen, Santa-NK1, Pumpking, Everscream, Mourning Wood, Flying Dutchman, Martian Saucer) will not drop a mask, they will still drop their respective Trophies.
 * The mask dropped by the Lunatic Cultist is called an Ancient Cultist Mask, rather than Lunatic Cultist Mask.

History
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