The Underwater Cultists

From the introduction: The adventure begins in a town in the swamp. The town is Gladvost Rapids, and both the terrain and town itself is covered in vines from the swamp. It was founded on the spot where an ancient evil was slain, and dark magic permeates the entire area. The ruler is a feared tyrant, a warlord that claimed the swamp and keeps it under control with raiders-turned-soldiers. The populace knows him as their only lord, and pay their taxes to him in exchange for peace. There's rumor that a cult has some dragon eggs and is performing weird magical experiments on them in a secluded part of the swamp.