A few hours later...
From Create Your Own Story
By the time the sun rises over Sartosa, the watchmen have recovered all barrels of warpstone from the sewers without any serious incidents. The riot in the city has thankfully caused very few casualties, but it would be difficult to find a supporter of von Carstein who is not covered in tar and feathers. Shortly before dawn, Nikola von Carstein himself left the city aboard his black ship Drakenhof. A considerable bounty was put on his head in the light of his involvement in the warpstone plot, and many captains have already set sail to pursue him.
The "interrogation" of one of von Carstein's lieutenants would later reveal that the plan was divided in two steps. The first step was to turn all of von Carstein's supporters into vampires to make them immortal. The second step was to detonate the warpstone to kill the rest of the city and later raise the corpses with necromantic spells. This way, the Carstein family would have gained control of a sizeable portion of organized piracy and would have been able to threaten the Empire with several hundred ships.
The grateful Pirate Princess is now offering you a high-ranking position in her fleet as a reward for your instrumental role in saving the city, but duty tells you that you must continue to pursue Nikola von Carstein until he is defeated once and for all.