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Ruby Cutter (ルビーカッター) is a kind of monster in The World R:2. The Ruby Cutter is a giant crab with a human face. It is said that even cats avoid the dead bodies or Ruby Cutters due to its ugly appearance, foul smell, and rotten taste. Although their shells make for an exceedingly strong alchemy material, they are avoided by most adventurers because of the resulting foul smell.