Marvel: Psionic Knife

Elizabeth Braddock (Psylocke)
Described as "the focused totality of her psychic powers," by intensely channeling and focusing her psionic powers to her hands, she can create "psychic blades" with razor-sharp edges of pure mental energy which are said to be the ultimate physical manifestation of her powers which she plunges into the minds of her targets directly. She often uses them to disrupt the neurons of her foes by driving the glowing "blade" of mental energy into their skulls. It is able to kill.