4 players duke it out with a infinite supply of spawning dwarves, dwarves learn spells when they level up and use Create Imps to spawn more dwarves if you are losing and is low on dwarves.
Funny single/multiplayer map i did in dungeon keeper 2. 1 sec dwarf . the dwarfs got 3x faster xp and can some skills when lvl 2 3 or 4. If you need backup, use the create imp spell to create dwarfs if needed.