A superweapon designed on War Hammer XII under Gilkarg nar Kiranka. Manipulating gravitons, it increases the gravitational field of a planet 137-fold, causing devastating conditions to everything on it.
After its completion, the Admiral ordered the Commander to use the weapon on the planet itself both to test it, and to leave no trace about its existence.[1]
It was equiped to the ship Sivar and was used to destroy the Goddard Colony with just one shot.
The Reavers somehow managed to gather data about the weapon and returned to the TCS Tiger's Claw were technicians downloaded and analyzed it. It was determined that there was nothing to deflect the energy blaster, but at least it was unsuitable against starcraft and fighters, as its needed time to be primed.[2]