No one truly knows how this energy source came to be, though the planet's Tech-priests are quick to claim credit if pressed on the matter.
In the centre of the planet's once-barren core is an artificial sun, a titanic fusion reactor that powers the industrial sprawl covering the inside of the world. A hollow world, Lucius has been part of a grand experiment that should have destroyed it a dozen times over.
Lucius is one of the Imperium's Supernatura Majoris, a unique jewel in the Adeptus Mechanicus' crown.