The Bastion Protocol

Tower defense against the Entrophage

The Bastion Protocol is a PC tower-defense game about holding off the Entrophage, a force that has been wiping out civilizations across the universe. You command a defense system built by the Precursors, a civilization that created a superintelligence to fight the threat. Their final creation is still waiting, and your job is to keep the tower alive through waves of enemies.

Building your tower

Your tower attacks automatically, while you decide which upgrades to buy and how to shape your build. Defeated enemies give you Entropy, the resource you spend on upgrades during a run. You can put it toward damage, attack speed, defenses, or economy. Those choices determine how your tower handles the waves as they grow stronger.