undoer

1. a seducer who ruins a woman;

"she awoke in the arms of her cruel undoer"

2. a person who unfastens or unwraps or opens;

"children are talented undoers of their shoelaces"

3. a person who destroys or ruins or lays waste to;

"a destroyer of the environment"

"jealousy was his undoer"

"uprooters of gravestones"