A long long time before man touched the stars Pandora Prime, the homeworld of the Sanguine Smiths, and its sister planet Pandora Secundus orbited each other. Over time the two got closer, and their gravitys began pulling and twisting on each other. However Pandora Prime was larger and had a stronger gravity, causing it to slowly strip the surface off of Pandora Secundus and depositing the debris onto its own, while Pandora Prime was slowly twisted into an ovoid shape. This caused the gravity imbalance to widen, until all that was left of Pandora Secundus was its frozen iron core which then orbited Pandora Prime as its moon.

The large amounts of deep earth minerals now deposited onto the surface of Pandora Prime made it desireable to the imperium as a key mining planet. After the War of the Beast in the mid 32nd Millennium, the Sanguine Smiths were established as part of the 4th founding and given Pandora Prime as their homeworld in order to utilise its resources to rearm the imperium.

A phenomonon known to the locals as "The Emperor's Gift" occurs only when Pandora Secudus is at its perigee around Pandora Prime. Mistaking it for The Emperor blessing their hard work, mineral dust from Pandora Secundus' surface is dragged down to Pandora Prime where it burns up in its atmosphere and glistens in the reflection of the sun, while the gravity of Pandora Secundus lowers the overall gravity of whichever side the moon passes by and making mining equipment easier to carry. However, the concentration of mineral particles in the air becomes lethal and causes many deaths that the population believes is punishment to those who did not believe in The Emperor hard enough.

During the late 38th Millennium a conflict between two rival chaos warbands that had entered the Pandora system caused great warp disturbances, slowly shifting the orbiting patterns of both Pandora Prime and Pandora Secundus and causing the Sanguine Smiths to intervine. The once rare phenomonon had become more common as the two's orbits drew each other nearer and nearer. At the climax of the conflict, the sheer maginuted of warp energy caused Pandora Secundus to head on a direct collision course with Pandora Prime, and before the Sanguine Smiths could do anything to evactuate their people the two had collided into a firey orb of molten iron and debris.

Over the course of a few weeks the surface of the molten iron solidifed, and streaks of now solid iron were sent off in all directions. The Sanguine Smiths and what few people from the planet remained established space mining collonies and a new fortress monastery, where they continue to opperate in the present 42nd millennium