Deploy your various units in strategic locations to prevent the enemy from escaping the area with your crystals. Deploy your various units in strategic locations to prevent the enemy from escaping the area with your Protect your party's crystals from encroaching monster hordes in Crystal Defenders, a defensive strategy game featuring characters from Final Fantasy Tactics A2. Summary: Protect your party's crystals from encroaching monster hordes in Crystal Defenders, a defensive strategy game featuring characters from Final Fantasy Tactics A2.