"Capture the flag" could be an interesting game variation over straight arena PvP. Basically, each team attempts to retrieve a special object from the other team's "base" and return it to their own "base" before the other team does likewise.
General suggestions:
* If a player on team "A" picks up the "flag" for team "B", the "flag" returns to its starting location.
* Death system: forced respawn, configurable delay before respawning, possible stat or HP penalties on respawn, after a set number of deaths character is out of the game. Respawns would not cost gold or XP, but would instead return the character to a spot near their own base. A player carrying the "flag" would drop the flag on respawn (or final death).
Once supporting scripts, palceables, etc. are created, they could be applied to any number of custom maps/areas (with or without other hazards) as multiplayer PvP modules.
10 - A Masterpiece, Genuinely Groundbreaking 9 - Outstanding, a Must Have 8 - Excellent, Recommended to Anyone 7 - Very Good, Deserves a Look 6 - Good, Qualified Recommendation 5 - Fair, Solid yet Unremarkable 4 - Some Merit, Requires Improvements 3 - Poor Execution, Potential Unrealized 2 - Very Little Appeal 1 - Not Recommended to Anyone