Commander Ribben, Champion of Nurgle, had something of a request for Castor: To send an infiltration team – or alternatively a squadron of ships – to look for Sergeant Adrotos of the Death Guard who had been lost on the planet Ichovor for some time. His own forces were unfit for infiltration and not powerful enough to enter by force. Castor decided to do better; once he had dealt with Regulas, the heart of the Celestine Alliance of agri-world he would take the entire 10th Host to Ichovor.

Regulus fell rather easily, despite its rulers having spent several fortunes on fortifications, defence weapons, privateers, and mercenaries: Turns out privateers run when they see Word Bearers and fortifying an entire world against and Astartes assault…is simply not possible. After filling every hold (and then some) with food and slaves Castor made sure to seed the world with whatever strategic area-denial weapons in his arsenal; Regulus would not provide as much as a bucket of grain for the Imperium until cleansed.

Another boon presented itself; a small Imperial squadron of Battlefleet Calixis was found tracking the 10th Host. Using great sorcerous rituals Castor was able to obscure parts of his fleet as they snuck up on the enemy; as short, vicious battle ensured. No less than two light cruisers were captured by Astartes boarding parties; admittedly one would never fly again and was towed to Diamantina, but it was still a spending victory. One destroyed got away though, probably racing right back to the sub-sector base as Fenksworld to report.