Fate 40k: Pandora Expanse
Hephaestion is a secretive Mechanicus forgeworld within the Pandora Expanse. Little is known of the enigmatic tech priests that reside here, though their presence is ubiquitous within the Imperial settlements throughout the Expanse.
It is rumored amongst esoteric and possibly heretek circles that the Hephaestion forgeworld is built on top of a dormant Necron tomb world, and seeks to exploit a hybridization of Necron-Imperial technology. This is, of course, utmost heretical of accusations.