Just as the player arrives to stop the Prophet of Truth, the Flood infested ship "High Charity", arrives in an attempt to take over the Ark. The player, Arbiter and Johnson now take out all the Flood in the area before Arbiter kills the Prophet of Truth and prevents the Halos from being fired. There is no time for the player to rest however, as he must now head to the nuclear reactor at the center of the Flood infested spacecraft, "High Charity" in an effort to kill the Flood. Once this is complete, the player and Arbiter must go and activate "one" Halo ring. This will destroy the Ark and kill all the Flood in this area of the Milky Way Galaxy whilst saving the rest. The player and the Arbiter head off to activate the single Halo and save the Galaxy. When they arrive 343 Guilty Spark warns them that activating this Halo will destroy the whole Ark and the Halo itself. The player ignores the warning. This angers 343 Guilty Spark. He kills Sergent Johnson, and attempts to kill Master Chief to keep 'his' Halo from being destroyed. This is in effect the final 'boss battle' of the game. The player defeats the robot, and activates the Halo. A countdown starts but it too late for the player as Master Chief and the AI Cortana. They manage to board a spacecraft to take them away but it is caught in the explosion and is split in two. Master Chief is assumed dead.
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