Quote Originally Posted by ericng View Post
Tessa has a computer mind, her mutant powers are mental whereas Magik's mutant power is teleportation and not mental.
Magik had psychic shields that prevented the most powerful telepaths on earth from getting any kind of read on her. Xavier and Emma Frost could not read her mind no matter how hard they tried. Karma, even with the Shadow King boosting her powers, had to strain really hard to possess Magik. She succeeded twice, the first time in Asgard with great difficulty, and the second time with Xavier giving her a power boost.