Found in the form of cards, these extra troops are usually found in chests, various campaign tombs, or as rewards on the Blessing Wheel. They summon several strong monsters to fight by your side as troops and can be selected on the Troop tab and dragged in to your current Troop slot. However, they cannot be upgraded with Daru. These can all be sold for decent amounts of gold, or they can be recruited and disbanded for the Daru.