Having played the Arena mode for a bit let me say the following:
OS2 needs a Mordheim Mode.
A PvP campaign where your PvP characters gain loot and XP, can get permanently injured or die permanently, with a league or campaign function simmilar to games like Mordheim, Necromunda or Bloodbowl!
Would it be possible to mod this?
I think it would make sense only if playing with a whole party of characters, rather than a single character, as otherwise perma-control (stuns, fears, freezes etc) mages will be extremely overpowered, especially agains someone squishy, like an archer or rogue. IMHO.