I think that there should be entertainers on the arena as well. Like musicans, acrobats etc.
You could also have different classes like..
*Newbie class - For newbies who thinks they are strong

). This is not often \"battle to death\". More like: fight until the other player surrender or lose consciousness (Which I think should be a feature) uses time-limit.
*Mage class - This is fun until the arena explodes

.
Only for magicians. No weapons allowed, only magic.
One-on-one. This don\'t have to be a battle-to-death.
Uses time-limit.
*weapon class - This is just for fighters. No magic allowed, only weapons.
This is a more dangerous class, so the chance to survive isn\'t very big.
Uses timelimit.
*Hand-to-hand class- This is for martial artists who prefers to use their own bodys as weapons.
No weapons nor magic. The winner is the one who knocks the other player to the ground, then a countdown begins (until 10).
*Pro class - Where players usually fights. This is for fighters, mages and martial artists.
However the players must be near the same level to fight each other.
Battle to death (or until you lose consciousness), or until the time runs out.
Grand Battle Championchip class - This is for everybody.
Every class, every level, all races.
Battle to death, no clock, no countdown. If you lose this competition you lose all your stuff.
This competition have only one rule. To kill the other guy before he kills you.
I made up the names, so feel free to come up with another names. :]