My PC's are nearing the end of their running battle through the abandoned Gold Dwarf hold of Dowinn's Lode underneath the Delphin Mountains as they battle through the shortcut to get to the Yuan-ti city of Ss'inthee'ssaree. Once out of the hold a trek through the Black Jungles (which is infested with Yuan-ti, snakes of all kinds, and Ti-Khana Dinosaurs), awaits them before they can launch their attack on the city itself. There they must find and destroy the cloning laboratory in which the snakemen are creating an army of Megalomen (large altered humans with immunity to poison and fanatical loyalty to the Yuan-ti) before the snakemen have enough soldiers to launch a devastating war against the human realms of the Chultan peninsular. they must also find and kill the scientist Esau Enoch who created the Megalomen and destroy his notes/research so that none can copy his work.
And once that is done, they have to head to Hlondeth to stop the Yuan-ti there, who are also making a Megalomen army. But first, they must defeat the tribe of Troglodytes, Trens and Black Scale Lizardfolk dwelling in what used to be the south gatehouse of the dwarfhold, to be able to reach the jungles.
And through it all, another power watches and waits and works against the PC's, an enemy who has attacked them several times now, and who they as yet have no idea as to their identity...