Mantle's Approach

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 is the name of the Didact's ship in Halo 4.

History
On Requiem, shortly after the Didact's awakening, the Didact was ready to enact his plans; however, the one thing that he still needed was the Composer. As the Master Chief and Cortana's plan to prevent the Didact from escaping the planet failed due to Cortana's rampancy, his Cryptum flew into his ship, the Mantle's Approach, before the massive Forerunner capital ship emerged from the planet with hundreds of Liches accompanying it as the Mantle's Approach entered slipspace to Ivanoff Research Station in orbit over Installation 03.

Despite the efforts of Cortana and the Master Chief, the Didact was able to capture the Composer and use it on the station's crew, incinerating all humans on board with the exception to the Master Chief. The Mantle's Approach then entered slipspace once more to travel to Earth, but was followed by the Chief and Cortana in a Broadsword fighter. It managed to hold off the UNSC Infinity and Earth's orbital defenses for a short time before the Broadsword was able to disable four of its particle cannons, allowing the UNSC ship to blow a hole in the Mantle's Approach's hull to allow Chief and Cortana to enter the ship.

Fighting their way through countless Prometheans, Master Chief and Cortana were able to reach the Didact and the Composer, though not before the Forerunner fired the weapon, incinerating the population of New Phoenix. After a brief confrontation between the Master Chief and the Didact, the Chief was able to detonate a HAVOK nuke, destroying the Composer and the Mantle's Approach.