A really big and nice survival mode (Some singleplayer minigame).
x amounts of bases randomly spawns creeps which go after your Demigod, goal is to survive as long as possible.
Creeps increase in difficulty along the way, or increase in numbers (can probaly be dependant on if you picked a General or Assassin.)
With some nice local/alternatelly remote highscorelist of amount of time/waves/creeps survived.
Perhaps with a optional "survive x amount of waves".