The Keyship[1] is a classification of supra-luminal Forerunner naval vessel in use at the time with the War against the Second Human Empire. Keyships were a class of Forerunner vessel capable of activating portals leading to the Ark. They were capable of remote detonation to prevent their usage by the Second Human Empire. Though many more once existed, the majority were destroyed by the Librarian to prevent the Second Human Empire from reaching the Ark.

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