The Candlestone Caverns are a vast labyrinth of limestone tunnels and caves located in the northeastern Aspodell Mountains of Andoran. They were exposed only two centuries ago in an earthquake. The caverns themselves are inhabited by dangerous vermin, kobolds of the Black Claw tribe, troglodytes, duergar, and undead, although the main denizens are numerous tribes of gremlins and dark fey. The caverns provide the most direct route from the surface to the settlement of the darkfey outpost known as Fallencrest and the Court of Ether.

Dangerous creatures from deeper in the Darklands find their way up through the caverns as well, and pose a threat to the local denizens as well as the nearby surface-dwellers. The clever kobolds of the Black Claw tribe have responded to this by creating a series of one-directional tunnels bypassing their territory and leading directly to the surface. In this way, many of the abominations which might never see the light of day, are provided with a direct and unobstructed route to Andoran, much to the consternation of the local humans. The kobolds have thus unintentionally given those able to track the Darkland creature’s tracks, an easy, trap-free path from the surface into the Darklands.

The entrances of the Candlestone Caverns are riddles with turn-abouts and traps. Part of the Caverns are the Troglodyte Warrens.

Troglodyte Warrens are series of caves inhabited by troglodytes who are zealot worshipers of Laogzed. The entrance to the Trog Warrens is gaurded by Slaads that seem to be pets of the Trogs. They use a strange black poultice obtained from a combination of Bilestone and strange plants that grow in the caverns. The poultice effects the Trogs by putting them in a trance like state which they believe helps them commune with Loagzed. The Trogs have a village known as Laogroat. Here they live and sacrifice to Laogzed. They have a series of magically locked portcullis to bare travel within their warren.

Beyond the Trog Warrens are the Burning Pools. An large cave filled with acrid pools of acid. Farther down can be found the Hanging Forest. A cave filled with stalactites and stalagmites inhabited by Ropers and Hook Horrors. in the center of the Hanging Forest a natural stone bridge spans a massive bottomless chasm.