 Arguments ensue and the Ur-Didact reveals the Gravemind drove him mad and that he would not let humans attain the Mantle.The Flood arrives and ravages Nomdagro as the Audacity and Mantle's Approach leave towards the greater Ark, now the last bastion of the ecumene.On the greater Ark, Omega Halo is there in anticipation for a Flood assault.