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Killer Box is a mid-level Mimic-type monster in The World that disguises as a treasure, often lying rigid on the ground. From time to time, or when it sees one or more PCs, it will stand up with six crab-like legs. To attack one single target, it stretches its white head (that looks like containing only a mouth in a mouth) with the long neck out of the treasure to bite. A Killer Box will also use Ranki Lei to confuse the party.