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. The party makes its way into the Demon’s Fen, where they find ‘Mourning Choir’, a winged serpent, guarding a rackety wooden bridge. Can the party ease the couatl’s broken heart? The miniatures is by Reaper. 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.