Aetherios is a Tower Defense style game where you will strategically place your Elementals to push back the waves of the swarm. You control the 4 basic elements Water, Earth, Fire, Air and you can also merge these to create new elements.
You can upgrades your Elementals by consuming mana, but ressources are limited on earth. Each time you upgrade a tower it will consume mana near it in a wider zone. Analyze the terrain and plan your defense accordingly.