Is there a way to avoid win in the arena without killing the gray prince after you have completed the quest origins of the gray prince in elder scrolls 4 oblivion

Its a theory, but yes



You know the dark brotherhood quest where u have to fake a guys death?

get up to there, get the blade and use it to kill the grey prince, u'll win then he'll come back to life, and u can use it on anyone the blade,:)

its a theory, if that fails

Big NO
The person above me is wrong, you cannot. I have the Oblivion Guide Book, plus I've tried it and the poison that fakes death only works on one person:the guy your ment to use it on, plus you only have the antidote for one person, so if that worked you would never be able to win that mission on the Dark Brotherhood, so no. He has to die to become the Grand Champion.