Infernal Sphere

The Infernal Sphere was a vast Dyson sphere built around an ancient black hole. It was the homeworld and laboratory of a demonic race of god-like scientists.

Keeping with the aesthetic of its masters, the Infernal Sphere was reminiscent of the common perception of Hell. It was full of "limitless darkness," and the black hole at its centre spun above a iron landscape of fire and occasional screaming. The atmosphere tasted of metal and blood.

During the War in Heaven, Lady Thelema acted as the Great Houses ambassador on the Infernal Sphere. After Thelema was corrupted by Thaumoctopus memeticus information, she murdered Prince Baphomet and his concubine Byzo. (PROSE: T.memeticus: A Morphology)

Mathara's fleet of Faction Paradox warships, which were made of Daemon skeletons unearthed from Dæmos, (PROSE: Interference - Book Two) were seen by Mother and Father as "skeletons pulled from the influence of the Infernal Sphere". (PROSE: The Story So Far...)

Behind the scenes

 * Simon Bucher-Jones' Doctor Who and the Exile from Hell, published in the Obverse Books charity anthology A Second Target for Tommy, features the Daemons and references the Infernal Sphere.
 * The Sphere can be seen as a twisted reflection of the People's Worldsphere, the latter being the "Heaven" to the former's "Hell".