Centuries ago, a group of Sith lords were sent to Oricon to study the arcane and powerful Phobis devices. When these Sith reemerged from their work as the Dread Masters, they did so with the intent of making Oricon their home. With the Emperor’s blessing, they transported thousands upon thousands of slaves to the moon to build a massive fortress.

Surrounded by deep pools of fiery lava, the fortress protects against all would-be invaders. Its impenetrable gates, powerful droids, and vicious, corrupted monstrosities guard a towering palace that contains the Dread Masters’ private chambers, where the Masters practice their dark arts. Once construction was completed, the Dread Masters used the fortress compound to expend their slaves in experiments designed to test the limits of the Phobis devices, and to explore the outermost boundaries of fear.

— Codex: Location – “The Dread Fortress”