well, I would like more detail as to what that first idea actually is.
Also, arena ideas:
[hider=Maze] A very large maze where everybody is put in different spots inside a large dark, damp, and spiraling maze filled with deadly traps, dead ends, and other beasties. It would have small rooms on the edges far apart from eachother, where each fighter would start. The doors to their cells would open and they could roam the maze. They would have to avoidtraps, kill eachother, and at the center of the maze, and invulnerable and superpowerful deadly minotaur rests. Once somebody enters the center room, he awakes, and runs through the maze in an attempt to try and catch and kill the fighters. Last one alive wins.[/hider]
[hider=Underwater] Basically, a normal colloseum, but it's completely underwater. It's made so that it seals off most of the water, but slowly, water drains in, eventually flling up the place. Last one alive wins.[/hider]
[hider=Living] This one is a little... disturbing. The fighters would be placed in a speacially breeded Giant's living systems, using their wits of the knowledge of sheep organs to not die and kill eachother. The Giant would be breeded so that blood would only pump through the body every few mintes, and it'd be like a large bloody beach wave (so that the fighters wouldn't always be thrown around all the time and could actually kill eachother. The Giant would also move around so that they would sway and be unbalenced. The Gaint feels nothing if organs are damaged.[/hider]
[hider=Collosus] Like the Living arena, but combined with Maze so that it sways, has traps, but you can climb along the outside of the Collosus and there is no minotaur.[/hider]
[hider=Jet] Basically the fighters areplaced on a very large flying Jet that moves across the sky fairly quickly. With both wind and the Jet's speed, the fighters would be quite slow and the best way of killing would be throwing eachother off of the Jet.[/hider]
[hider=Parkour] The fighters are put in a large room filled with nothing but big pillars a little bit aways from eachothers. Far below the pillars, a field of spikes lays so that if you fall, you will get punctured. Fighters have to jump from pillar to pillar and maintain balance to fight.[/hider]
[hider=Torture Room] Bassically like the maze, but with no minotaur and jammed into one room with even more painful traps and devices coming from the floors and walls. Mostly based on luck, but last one alive wins.[/hider]