The Obion Three, an elite group of tenno, were sent to Mars' moon to release one of their old comrades still held in stasis in the void. Unfortunately for them, not only has the portal been discovered, they find that the Grineer have already infested the entrance and are guarding every point of the dry desert surface of Eris. Once more, Captain Vor is preparing to use his prized golden void key to enter it and capture the tenno in stasis. The Obion Three must save their comrade, but what will happen if they interrupt the portal opening to the void? It seems that whatever they did will 'infect' a new world and might condemn it forever, and this world is on the verge of a great cataclysm of its own. The balance must be maintained in all things and all places.