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Pre History
During a battle between the X-Men and the Acolytes, Professor Xavier used his psychic powers to shut down Magneto's brain and render him catatonic. All of Mangeto's negative thoughts and energy were siphoned into Xavier, and combined with every negative feeling Xavier himself had suppressed for his entire life, creating a psychic entity within Xavier calling itself Onslaught. Onslaught lay dormant for some time, but Xavier snapped one day, manifesting Onslaught. With a Magneto-like suit of armor and the massively enhanced abilities of both Magneto and Xavier, Onslaught was a true threat to the Marvel universe heroes.
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