Fallen Into Evil
The Road Darkens #83 (x1/x0)
Treachery

When Revealed: Attach to a non- hero and move it to the first player's staging area. (Counts as a Condition attachment with the text: "Attached hero loses the hero card type and gains the enemy card type withThreat equal to itsWillpower and engagement cost equal to its threat cost. If Fallen into Evil is discarded, return attached hero to its owner's control")