Lok'kroll

These hulking invertebrate aliens, having damned themselves in the worship of the Ruinous Powers, had risen up within the span of no more than a Terran century to carve out a pocket empire to the galactic south of the Warp anomaly known as the Storm of the Emperor's Wrath in the Segmentum Ultima.

Given their rapid expansion and the massacre of several Imperial colonies and mining outposts in the region, the decision was thereby taken by the Imperium to scour them from the stars before they could grow into a greater threat. Under the Novamarines' direction, the alien demesnes were systematically blockaded by squadrons from Battlefleet Ultima, while the Novamarines, supported by the 109th Phyrus Army Group and numerous Deathwatch Kill-teams, attacked and destroyed the isolated Lok'kroll outposts and nest-worlds one at a time, often employing Exterminatus-class weaponry sanctioned by the edict. Nothing now remains of the Lok'kroll save for a few taxidermically-preserved specimens at the Bastion Geniticus on Varsavia.