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Can't crack a brain made of a star with a scream. Mabey Gladiator could rip his head in half but i hear the star he riped was medium like our sun.

I think you can physically keep Xorn down :/

Did you read the origins comic of Xorn presented in X-men. Something big was running wild and nothing could stop it but to Xorn it was like petting his fav. dog.
Physical superiority another words doesn't seem to be a problem for him.