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Steam Shell (スチームシェル) is a kind of monster in The World R:2. They are magical weapons that were left behind after being used in the war between humans and beasts. They were transformed into monsters by the Shadow. The monster systematically attacks without any emotion. It is one of the most hated monsters by adventurers. Ogmios have repeatedly requested the Arvakv to take responsibility for the Steam Shells, but so far the Arvakv have evaded answering them and have only said that they are looking into the situation.