Claymore

Source: AniDB.net

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Long ago, Youma, shape changing demons, took human form to live in disguise in human towns, feeding on them in secret. A secret, nameless society has discovered a way of implanting Youma flesh into humans to create hybrids powerful enough to defeat the Youma.

A hybrid's standard abilities include faster healing, limited shape modification, the ability to detect Youma and other hybrids, and overall enhanced physical prowess allowing them to wield massive claymores, for which they are named: Claymores.