Adventure 7 - City of Broken Idols

To stop the demon attacks on the island tribes, and to recover a missing missionary of Pelor, the party travels to the Isle of Dread's central plateau and faces the powerful creatures that inhabit it. The party undertakes this journey together with Jakara, the survivor of a demonic massacre who the party rescued from the troglodyte caverns, and an olman religious leader who bolsters the party's numbers with undead minions.
The party comes upon a rakasta temple but find none alive within except for a couatl, the last defender of the cache of weapons the rakastas made in preparation of a great battle with the demonic forces. The couatl hands over the weapons and even bestows a boon upon the party, granting them three feathers that can be used to summon the lawful outsider to their side in battles to come.
During their exploration of the island's interior, and after a short skirmish with toadlike demons, the party meets the brave followers of a missing missionary named Noltus Innersol. Unknown to these followers, Noltus has been killed and replaced by a shapechanging maurezhi demon who soon springs a deadly ambush on the party.
On the shores of the central lake of the plateau, the party explores an abandoned village, whose population has been exterminated to supply human sacrifices to the demonic forces of taboo temple. From here, the party invades the main base of the cult of Demogorgon on the Isle of Dread and defeats Khala the Two-Headed, an aspect of the Prince of Demons himself. Although Khala can escape, the party decides to return to Farshore.