Massoss was a planet of the Chiss Ascendancy in the Unknown Regions. It was home of a former Ruling Family. Although it was a homeworld of a Ruling Family, Massoss wasn't located on the Path of the Houses, probably due to its distance from the core territory of the Ascendancy.

This planet was largely wiped out prior to the Swarm War and the Ruling Family became Joiners.


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