*brainstorms*

This is what I came up with for the "Bring Em On!" thing. First and foremost, the arena needs to be is rigid enough to make Spaz's sidekick more inefficient and then. Secondly, the arena has to be filled with No Fire Zone events. How it would work is everyone starts with a shield (for how ever long) and the server would be at the bottom of the level to keep time and hit a crate for each new wave of enemies. After a round is over, the server hits a regenerating crate that opens a hole which everyone must enter (the arena could also be designed so that it entirely disappears when the crate is hit, but that might be unnecessary work). The hole leads to a system where if you don't have a shield, you get warped to the loser room (the same system with hurt events I used in my Shield Assault levels). Every round, players who survived get a new shield, and this goes on until someone wins.

That's all I could come up with.