Kingmaker. Part 2, Rivers run red

The heroes of the Kingmaker Adventure Path have claimed their kingdom, and the first shipment of supplies and gold has arrived from the distant north. While the heroes further explore their new home, they must at the same time help manage and rule their nascent kingdom, establish towns and roads and resources, and keep their realm's growing population happy. These tasks are made much more difficult by regular attacks by marauding monsters, encroaching tribes of barbaric trolls, and a mysterious but legendary monster roused from ancient slumber by this expansion into its wilderness territory. And perhaps worse of all, the bandit lords of the River Kingdoms themselves have taken notice of this expansion, and when they turn their retribution north, the rivers will run red with blood. A Pathfinder Roleplaying Game adventure for 3rd-level characters.