This fortress stood on the frozen moon of Cavamina Minor. A courtyard was visible from its balcony. Shon-Ju and his three apprentices seized control of the castle in 21 BBY. Their goal was to halt the activities of the mercenary Attuma Duum, whom they were chasing. The students saved Aayla Secura, a Jedi Knight, and brought her to the fortress to heal. Upon awakening, she located Shon-Ju, and they decided to cooperate. The following day, they commandeered a pair of bombers that Duum had left behind.
The graphic novella The Clone Wars: Deadly Hands of Shon-Ju, released in 2010, features this castle.