The rebels knights known as Brave Head have raised a powerful army to invade the kingdom. Their goal? Obtain the power who control the four primary elements that govern the world. But for now this power is in your hands and you will need to defend your land by building towers and using fire, rock, ice and lightning to repel the invaders. Special spells may also be used in battle to help you and keep the situation under control. After each battle, with the experience gained on the battlefield you will improve the power of towers, elements and spells.