Pillar of Autumn

The Pillar of Autumn was the ship that escaped Reach after its destruction with Johnny and Cortana on board. It happened upon Halo Installation 04, onto which it dramatically crashed. The ship was used briefly as a headquarters for the Human forces on the ring, but was later abandoned when the Flood were unleashed. It was visited by Johnny and Cortana in their attempt to destroy the ring, but Guilty Guilty disabled all command access and so they had to manually blow the slag out of the engine cores before the ship finally decided that it just wanted to blow up. As Johnny and Cortana fled in a longsword and Guilty Guilty flew out of a window, The Autumn exploded, taking a large chunk of Halo with it. This caused the entire ring to splinter and shatter, taking an entire Covenant Armada with it.