The Mystic is a strange reptillian witch from the video-game "Kameo" and appears at first to be a benefactor towards the titular hero, however as the game progresses the true nature of the witch is revealed.
The Mystic is ultimately revealed to be the true antagonist of the game, having corrupted both Kameo's father and Kalus by tricking them into getting involved with Thorn by any means necessary - thus making her responsible for all the chaos that was unleashed as a result.