The Battle of Roq was the final engagement of the Second Swarm War between the Imperium and the Vagaari hives. The Imperium's three Centurions—Joiners Eskol Kaartinen and Chindal, and the unaffected Qua Te`net Organi—united to lead an assault on Roq, the adopted homeworld of the Mollom and other Killik nests and the last remaining Vagaari hives world.
During the battle, the three Centurions sacked many of the fortifications the Mollom had erected, hunting down and killing off the Vagaari who had been absorbed into the Mollom nest over a decade before and begun the Joining that oriented the Mollom toward conquest and enslavement in the first place. While the large, hardy Mollom put up a ferocious fight, most of the other Killik nests had been absorbed into the Imperium, and the Imperium was able to simply bury the Vagaari hives in bodies. The Imperium's space vessels also devastated or captured the remaining Vagaari ships and shelled the strongest points of resistance from orbit.
Once the Vagaari were exterminated and Roq taken, the surviving Mollom began to be absorbed into the Imperium as well.