Three years after the events of Final Fantasy VII, an unknown group of powerful SOLDIERs known as "Deepground" appear, bringing a swift and bitter end to the peace enjoyed by the people of world. The members of this enigmatic group are the ones who were trapped under the ruins of Midgar for three long years after Meteorfall; their intention is to call forth the final WEAPON, Omega, before its time. Awakening Omega will trigger the end of Gaia, as Omega takes the Lifestream and departs for the stars. However, to do that, the DGS need Vincent's Protomateria, the agent by which he controls Chaos, the final WEAPON. The leader of Deepground, Weiss the Immaculate, plans to summon Omega in what he believes to be the best way to do so. He knows that Omega normally would only awaken if an enormous catastrophe occurred. Sephiroth nearly caused Omega's awakening by casting Meteor, and the only thing that saved Gaia was Aerith's Holy. Weiss intends to recreate the effects of a successful casting of Meteor - a massacre on a global scale. Chaos, i.e. Vincent Valentine, attempts to stop Omega, succeeding in temporarily destroying Omega, and killing Weiss. After the planet is saved Genesis picks up Weiss (who is dead) in the flooded cave under Midgar and tells him that their work is not done as he flys off into the night.