Presidio of Drago Umbra

From publisher blurb: Your PCs are relaxing after another grueling adventure when a rider appears on the horizon. A messenger from the Horselords speeds up to you, out of breath. He carries a missive from the 3rd son of the ruler reaching out for your assistance. Back your bags, you're going back to Uvarno! Although set in the Pangia Campaign, this adventure setting is easily adaptable to most any game and system.