“Piper Halliwell: A wendigo. Apparently, it looks like a normal person during the day but then transforms at night. It survives by feeding on human hearts. Billy Waters: What? Piper Halliwell: According to my information, the first wendigo was a mortal who, betrayed by his lover, cut out her heart an…”
— Edithe Swensen, Piper Halliwell, Holly Marie Combs, imdb.com