Aetherspire is a cooperative 3D tile placement and tower defense game for 1-4 players. 

You and your companions will take on the role of Elementis heroes, working together to mold elemental power into four spires, one of each element: earth, air, fire, and water. A spire is a set of four floor tiles, one on top of another, all of the same element. Each time you complete a spire, that element’s aether fiend is defeated. Once all four aether fiends have been defeated, the heroes share in glorious victory, having restored balance to the realm of Elementis!

However, if the precious aethercore is depleted, or if you take too long to defeat the aether fiends, then the heroes lose the game, and chaos will overtake your world!