Belsus
From Wookieepedia, the Star Wars wiki.
Belsus was the moon of Gentes[1] in the Anoat system. It was the location of Ugnaught Main Rendering Plant Nine-Zero-Eight, where Flynn Kybo died trying to kill Grievous, who had crushed all resistance on the planet. Grievous had attempted to establish a laboratory for study of the Force. The underground cities were devastated when the moon's thermal core was destroyed by Kybo.
