hehe
 

has anyone thought in terms of star trek weapons....
...plasma cannon
...phase pistol
...photon torpedoes
...warp engines
...hull plating/shields

or any other of that cool stuff from sci fi shows
it would make 4 an interesting battle

Two words:

Black Hole

Launch some of those time-space bubble things that were in the Tomb Raider movie, then be able to teleport around the arena and launch plasma burst into your opponent, knocking him into the bubble, dismantling him completely.

How about a shaped charge explosive?
It's a conventional rail gun, using explosives.
Launches a rod of copper at 10 miles/sec
All in a 5"x5"x 15" box!!! >:)

Available at Lawrence-Livermore Projectiles Lab Just 12,999!!!
(blast chamber sold seperately)