The Flesh Panopticon is a large organism of unknown type, similar to the Flesh Prison. It is found in P-2: WAIT OF THE WORLD as the first of the two bosses. It releases Sisyphus Prime upon death, although the latter tore his way out of the Panopticon by himself
Sisyphus prime: "This prison… To hold ME?" (Sisyphus breaking out of the Flesh Panopticon)