The Door of the Sith was a portal to the realm of Chaos, a harbor for long dead Sith spirits. A natural tear into another dimension had been discovered on an unknown planet to the rest of the galaxy sometime after the Great Hyperspace War. The portal sat deep in the planet's crust, near to molten regions. A door was built around the anomaly, which had sat in a large crevasse in the bedrock, containing it as well as preventing it from shifting elsewhere.