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Humanity was ravaged by a black fog known simply as Chaos, summoning horrifying monsters that tore through defenses of the various nations of Earth in just 36 hours, and forced the survivors into space. The surviving humans attempted to use their advanced tech to reclaim the surface, but their efforts failed, so instead the remaining humans abandoned Earth, drifting through the cosmos in spaceships known as Arks. Over the following century, humans found a way to craft technology that gave themselves some protection against Chaos and infiltrate planets where it spread, and have decided to use this to find the source of Chaos and destroy it completely. This Campaign became known as the Chaos Zero Project, which you (the player) are now in charge of as "Protos."
Gameplay
Players choose teams of 3 Agents (and 3 matching Partners, if desired) to head to the surface and take on the challenge. Combat stages are done with cards. Generally a hand of 6 is drawn from the Agents' combined cards and any additional cards picked up or transformed during the stage. The agents share a health meter, so they can continue acting until the meter reaches 0. However, each character has sanity that will trigger a mental breakdown if it is too low, blocking out their normal cards and cutting off their contribution to the team's max HP, and forcing the player to decide if they want to spend resources helping them recover or continue battle with their unbroken Agents.