Paizo's adventure module 'The Harrowing' fits as a perfect sidetrek into 'The Curse of the Crimson Throne' adventure path. Looking for the disappeared fortune-teller Zellara, the PCs are drawn into the Harrowed Realm, a demiplane that is bound to the soothsayer’s deck of Harrow cards. As night falls an artificial moon creeps into the sky, atop a mechanical arm. The party makes its way into the Demon’s Fen, where they find a couatl, a winged serpent, guarding a rackety wooden bridge. Miniatures and scenery are by Reaper, Dungeons and Dragons and Zealot Miniatures. If you want to learn how this crazy adventure goes, you can go to the campaign journal section of Paizo's messageboards under MrVergee's Curse of the Crimson Throne.