Ple-Sen
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Exactly, he was altered by Urgash's magic, but he isn't a full-fledged demon. As for the exiled Sylvan elves, the magic of Malassa didn't turn them into Faceless Ones. Regarding their personalities, Biara and Xana are quite similar; both are succubi and schemers. Kha-Beleth's appearance in Heroes of Might and Magic V and Dark Messiah is also different, and we haven't seen Biara in human form; we've only seen her as Beatrice and Isabel.