Steadfast is a high-octane action shooter mashed up with an asymmetric mega-monster battle that takes place in the massive island city, Amphion. Players looking for an infantry-centric experience can choose to enlist into the Amphion Defense Force to combat the monster and preserve their home island. The Amphion Defense Force features two swift humanoid character classes and two massive mech classes that are each specialized in their own way and are armed to the teeth, ready to dispatch any threat that dares enter their city. Players with an appetite for pure carnage and destruction may also choose to play as the massive, ultra-powerful monster named Zethus. Slam, smash, and bash your way through the city to each of the special objective locations, or stomp enough soldiers, to cripple Amphion's infrastructure and reclaim the island as your own. The fate of Amphion lies upon your actions – will you save it or will you smash it?