Csilla was a frigid, ice-locked planet in the Unknown Regions. It was the homeworld of the sentient Chiss species, including Imperial Grand Admiral Thrawn, and was part of the Chiss Ascendancy. Though largely unknown to the wider galaxy during the age of the Galactic Empire, exploratory missions to the Unknown Regions conducted years later revealed Csilla and other worlds that could be reached through cautious hyperspace jumps.
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