Oblivion

I just went into the Dagen Shrine, and stole the Mysterium Xarxes.

After that I just ran out, didn't kill Harrow, is there anyway I can get my stuff back, and if not, does that mean I can no longer fight in the Arena? 

Hi, not sure if you can get your stuff back probably you can go back in and kill him.. as for the arena there are new armor sets in the cupboard beside the Bandmaster it should be just to take a new one. XD

I should think there is a way to get your stuff back... because you probably have sum quest items you need.. you could just go to a past save jack down the difficulty and do it again. Easy peze, lemon squeezeeee!  :P