Prison Break: Final Leap

Anna's eyes widened as Kass spoke. "What do you mean, a monstrous guardian?" 

Kass turned to face her, her expression grave. "It's a creature that the Empire has kept on this planet for centuries. It's one of the most powerful beings in the galaxy, and apparently, they've trained it to be loyal to them."

[Ashton-]

'I know.'

The Empire's way of protecting the prison was eerily similar to that of the Xyrans, or one could say the Precursors, as Xyrans had copied most of their things from the Precursors. 

The only difference was that the Precursors had named their pet Hydra, and the Empire called it a Behemoth. 

Kass continued, "It's been dormant for a long time, but if there's any kind of disturbance around the prison, it will awaken and begin to eliminate any threats to the Empire's security."

"No wonder the Empire didn't care about the prison's security upgrade. They already know no one could escape once the Behemoth awakened."