Razing of the Witch Worlds

The Razing of the Witch Worlds was a two-year long joint-Chapter campaign of retribution against the recalcitrant worlds of the Vompiyya System, which had fallen under the control of rogue psykers, which held the worlds of the system enthralled to their diabolical whims.

Background
When the worlds of the Vompiyya System cease their payment of the Imperial tithe, a secretive investigation by the Ordo Hereticus reveals that the three inhabited worlds within it have been usurped by a heretical magocracy, in which unsanctioned psykers have overtaken rule of the loyal Imperial population in a horrific reign of terror in which the citizenry are treated as livestock used to satiate every need and desire of the ruling class.

The Ordinators, with the aid of the Astral Leviathans, manage to cleanse each of the witch-lords and their minions from each world in under a year per planet, as the Ordinators' superior psychic conditioning enables them to act as a vanguard in many operations against sorcererous foes as they are better able to withstand their foes' psychic assaults. During the brutal campaign the two chapters wage to destroy the enemy's centers of power, though a number of entire hive cities are left as burning necropolises in the course of the war.

The campaign came to grisly end with the command squads of each respective chapter holding out in a last stand within the throne room of the vile psyker-queen. the Void Empress, after setting beacons for a precise orbital bombardment after multiple wave assaults failed to penetrate the void shield generator in the heart of the palace. The Ordinators Auspexus (Chief Librarian) kept the potent enemy psykers relatively at bay as the Leviathans' Commodus (Chapter Master) and his Honour Guard sacrificed themselves in the midst of the onslaught of enemies, taking down many times their number in heretics and their legionaries - allowing the Ordinators Auspexus to be extracted and bombard the enemy strongholds bringing and end to their reign.