The Arena (once he arrives) is a large tower, and every floor besides the first is an arena. The shape of each arena was different, and the terrain was different as well. Clerics were held on standbys n case of an accident, but most of the time they were needed only to heal the wounds afterwards, for everyone not involved in a deathmatch was handed merciful weapons to use. (Every blow is meant to be nonlethal. Merciful weapons add 1d6 of nonlethal damage, and make all other damage nonlethal as well. This effect can be left off, but is heavily frowned upon in any non-deathmatch event.) "Ah, good day sir. How can I help you?" The receptionist/registration officer asked.
(Decide weapons used, and style of combat. Combat can be Anything Goes, Magic Only, Martial Arts, Weapons Only, Fists Only.)