From Zelda Wiki, the Zelda encyclopedia
Lupay the Hypnotist is a boss in Link: The Faces of Evil. The Three-Eyed Wolfgirl Lupay is called "the most dangerous of Ganon's minions" by Gwonam.
She is an anthropomorphic wolf-like creature who possesses a third eye and the ability to turn Koridians into pig monsters by using a "ruby" that "replaces (their) soul(s)". She is defeated by Link when he deflects her shots with his Reflecting Shield (in a manner similar to the Wizzrobe from Zelda: The Wand of Gamelon,) fading away in a strange white light and most likely dying. She is the only major boss in the game, other than Ganon himself, whom Link only fights once.