Imperial Sanctum
The Imperial Sanctum is an existing location from Legends.[1]
The Sanctum was constructed on top of a shaft that led down to the geometric center of the Imperial Palace. At the bottom of the shaft, there were repulsorlift pillows to catch anyone jumping down. From there, a corridor led into Palpatine's secret lair, which contained several chambers marked with Sith symbols, among them the Chamber of Learning, the Chamber of Weapons, and the Chamber of Life. The Chamber of Life held six cloning cylinders, three to each side; eight months after the battle of Endor, one of these cylinders was occupied by a clone of Ysanne Isard, another was degraded after Sate Pestage's clone had been decanted early, and the remaining four were empty. In late 5 ABY, Isard had her cloning tank moved to the buried Lusankya and the entire lair below the Sanctum flooded with duracrete.[2]