The Infinite Engine was created by Darth Revan from a piece of the Star Forge. It was hidden away in a sealed and droid protected factory on Nar Shaddaa. Ongree slaves were sealed in with the Infinite Engine to serve and protect it. The Infinite Engine appears to feed off of the force and provide the Ongree slaves everything they need to survive. These Ongree have lived for generations sealed in with the Infinite Engine and will apparently die if it is taken away from them.