The armies fight on their own. Each castle has two magic boards in its wall, and luck decides how its army grows.
Fate board (lower): every 10 seconds the tower cannon fires an orb onto the spinning pegs. Split breaks the orb in two for an extra drop and adds a fighter to each wave, Supply speeds up waves, Giant makes fighters bigger.
Weapon sends the orb back to the cannon, which fires it into the Armory (upper board) to stock a weapon. The more of a weapon you stock, the more often it shows up.
Math sends the orb to the Math Engine in the middle. It drops on a number, then an operation, then another number, and keeps going round until it lands on =. Work out the answer before it shows: that many recruits join your army (up to 30). Beat the “Bigger than…” target for a free armory shot too.
Champion is locked. Kills earn souls; the number on the crown counts down. Once it’s ready, an orb landing there summons your champion.
Players can only nudge their team's falling orbs. Three nudges, one back every 5 seconds.