Wytchwolde-Under-Ash, once a great Thorpe, was razed to the ground by the ruthless, and truth told more than slightly deranged, Porcelain Princess and her henchmen, the Purifiers. When the flames had at last subsided, and a kaleidoscope of swirling, dull-gray ash choked the sky, nine hundred acres of old growth iron spruce, black larch and weeping birch, was burned to utter cinders, along with the entire coven of witches comprising the Sisterhood of the Silver Teat.
Now, centuries later, the forests are somewhat re-grown, and the town of Foolswater stands where Wytchwolde-Under-Ash once did. It is said that even to this day, one can still find ashes in the otherwise potable well-water of this village. Once a year during the Winter Solstice, the “Ash-Wind” comes to Foolswater, a suffocating black cloud that passes quickly but leaves dead birds and animals in its wake, darkening the trees, and staining the sky with black snow. The inhabitants of the village know better than to be caught outside during the day-long Ash-Wind. Everyone is locked snugly inside, singing old hymns that curse and re-curse the burned witches who once called this place home.
A village where everyone goes blind sometime during puberty. What could be causing this? Perhaps something in their diet. Or some malignant gene. How would an entire village where only young childen can see function?
The PCs encounter an elaborate trap room, designed to fill with water, drowning those inside. Clever and resourceful, they disable the trap and move on.
Only later do they discover that this room is part of the elaborate cooling system that prevents beasts of elemental fire from overrunning the complex. While the fiery beasts run rampant, they begin setting fires, which causes the complex to become increasingly hot and smoke-filled. Additionally, the PCs now have to fight their way out past aggressive fire creatures...