Shen Xorn, simply called Xorn, is a member of the X-Men superhero team. Shen and his twin brother Kuan-Yin are mutants with nearly identical power, they both have miniature stellar bodies inside of their heads and allow them to generate and manipulate various forms of energy.
The X-Men found a mutant similar to Kuan-Yin Xorn. While quarantined he was examined by Emma Frost. He explained that he was Kuan-Yin's twin and his brain formed a black hole rather than a star. He claimed his brother had been affected by an outside influence, later revealed to be Sublime, that caused his madness and posing as Magneto.
While the X-Men faced the Brotherhood of Evil Mutants, Xorn removed his helmet to draw them into the black hole, including Juggernaut and Nocturne. Afterwards, he wanted some time to meditate on the subject instead of joining the team like his late brother. The black hole inside of Shen Xorn's head led to the Mojoworld where the Brotherhood members gave Juggernaut and Nocturne to Mojo for their freedom. Juggernaut and Nocturne later found a way to escape Mojo.
Shen lost his powers during M-Day.