The Unggoy are the most common and one of the lowest ranking castes in the Covenant Empire. Needing Methane Gas to live, they must carry large methane tanks on their back. They are crab-like bipedal creatures forced to join the Covenant Empire after their planet was sent in to something similar to an ice-age caused by over-industrialization. The Unggoy are used for the majority of labor in the Covenant Empire.

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