In another cutscene a human ship with Master Chief,Johnson and Cortana aboard follows the covenant ship through the portal to the new Halo. The player must now take control of Chief as he battles to stop the Covenant from firing the ring. Eventually the player kills the Prophet of Regret, a Covenant leader, and stops the Halo from being fired. Unfortunately before the player can recover the Index, the control for firing the Halo, they are captured by the leader of the Flood, known as "the Gravemind". In a cutscene we see the new Arbiter sent down to the Halo to recover the Index before Chief can destroy it. When he arrives though, he and his followers are betrayed and their former allies begin to attack. Here the player must control Arbiter and his followers as they attempt to escape the betrayal and ambush. The arbiter is eventually also captured by the Gravemind and meets up with Master Chief. The two of them break free of Gravemind, whose Flood followers have now taken over a huge Covenant ship called "High Charity". Arbiter and Chief, now controlled by the player again, race to the Halo control to stop the Covenant from firing the ring one last time. They are successful in stopping the Covenant, but the Prophet of Truth, the last of their leaders escapes on a spacecraft unharmed. Chiefs AI companion Cortana stays behind on the Halo, promising to destroy it if any Covenant ever return. Chief and the Arbiter part ways with Chief hiding out on a fleeing Covenant ship and the Arbiter and his followers returning to "High Charity" in an attempt to save it from the Flood.