The Hanging Moss Citadel was the Sith Citadel constructed by Diaeta and Incursionus during the Endor Sith Breakaway. It was built in the forest of Endor, near to what had once been Hanging Moss Village.
The Citadel was constructed in the weeks immediately after the breakaway.
The Citadel was then put to use as a Night Jedi military base, housing many infantrymen. However, in the cutbacks that came in later years, the base was abandoned, and the citadel collapsed, and was consumed back into the forest.