From Halopedia, the Halo wiki
Once the initial colony on Harvest was established in 2468, Skidbladnir remained in orbit for more than a year to assist in the construction of the basic infrastructure for the colony. Once the task was completed, the colony ship landed on the planet's surface and was scrapped for materials. Skidbladnir's power plant and engine were then used to power the capital city of Utgard, despite the Colonial Administration Authority's concerns over the engine's capabilities.
In Norse mythology, Skidbladnir was the ship ordered built by Loki and subsequently given to Freyr as part of Loki's recompense for stealing Sif's golden hair. The ship was big enough to fit all gods and yet small enough to fit in a pocket.
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