A Night Jedi Citadel was a teaching establishment, and cornerstone of the Night Jedi structure. A Citadel would be established on a planet by a Patriarch, and would serve as a place to house and train Night Jedi students, and also was used as command center for Night Jedi defensive forces.
Main Article: Hoth Citadel
Managed by High Patriarch Tenlith, the Hoth citadel was constructed near Echo Base, and was the original home of Rahmus Baktran, and was part of a project to terraform the ice planet, until the terraforming machines were destroyed. The citadel was presumed destroyed by invading forces.
Main Article: Kashyyyk Citadel