Celwis's largest moon
Celwis's biggest moon resided in the Unknown Regions and moved in an orbit around Celwis, a planet in the Chiss Ascendancy under the control of the Chiss Xodlak family. This terrestrial moon featured a cliff face that hid the derelict Chiss frigate called the Midsummer. The vessel had been abandoned there after the Xodlak family's status was reduced from a ruling family to a member of the forty Great Families. Circa 18 BBY, the Xodlak reactivated the Midsummer with the intention of using it to claim a world abundant in the metal nyix.
Behind the scenes
The largest moon of Celwis was referenced within Thrawn Ascendancy: Greater Good, a 2021 novel and the second book of The Ascendancy Trilogy by Timothy Zahn.