The Demonskar Legacy
After a riot erupts in the streets of Cauldron, the PCs must track down a missing paladin before the mob tears the city apart.
The PCs try to stop an assassin during the riot and get invited to a meeting, where they are tasked to search for the missing paladin. After some investigating they will travel to Vaprak's Voice, an ancient Spell Weaver laboratory, at the edge of the Demonskar. In the dungeon they will find the "Starry Mirror", a puzzle/travel device through which they have to travel, to find the missing paladin.
Part 4 of The Shackled City Adventure Path
Pgs. 44-82