The castle is being attacked by enemy troops, and the enemy has a variety of different arms: archers, infantry, wizards and stone throwers. Players need to choose different counterattack elements according to different arms. Choosing the right attack method can eliminate enemy forces faster. (Archer needs to use: fire element, infantry needs to use: thunder element, wizard needs to use: bow and arrow, stone thrower needs to use: ice element). The task of guarding the castle is done by you!