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Onslaught is a powerful psionic entity born from the inner hatred, resentment, and malignance from both sides of the mutant struggle when the minds of Professor X and Magneto momentarily merged. Professor X’s breaking point came when Magneto ripped the adamantium from Wolverine’s skeleton. In a final act of desperation, Xavier used his telepathic abilities to render Magneto catatonic, inadvertently absorbing Magneto’s intense emotions and negative feelings, which combined with Xavier’s own repressed darkness. This fusion birthed Onslaught, a separate entity within Xavier’s psyche. Initially dormant, Onslaught’s emergence was catalyzed by Xavier’s mounting frustration with societal hostility towards mutants and personal tragedies, and Onslaught was freed when Xavier’s astral body was pulled down to the physical plane by Nate Grey.

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