undoer

(noun) a seducer who ruins a woman. Example: "She awoke in the arms of her cruel undoer."

(noun) a person who unfastens or unwraps or opens. Synonyms: opener, unfastener, untier. Example: "Children are talented undoers of their shoelaces."

(noun) a person who destroys or ruins or lays waste to. Synonyms: destroyer, ruiner, waster, uprooter. Examples: "A destroyer of the environment." "Jealousy was his undoer." "Uprooters of gravestones."