Head to the center of Smith's Haven where you will find a well. Use the Waterborn Orb to summon a Sea Serf. Sea Serf in tow head to one of the many building that are on fire. When you approach a fire the Serf will automatically extinguish the fire. Please note that the Serf will only extinguish fires that are on the same elevation as it. After the Serf puts out one fire it will die and you must return to the well to summon another. Extinguish three fires then return to Greilyn Sevillien for your reward.