Bugs, scorpions, bats and more unpleasant stuff visit your world. Choose one element and show them what water, fire, air or earth means.
The chosen hero must survive all the levels and defend the essential towers, plus the building producing enemies must be crushed. Use spells and attacks to defeat the incoming enemies or try controlling a special defensive tower. They help a lot because many things happen in one moment and the whole game can turn into a chaos. The upgrade and spell improvement system is really good too.