Felanwn

Felanwn is an enormous megacavern of the Underworld beneath Althesar, home to a stunning crystalline sun, and myriad underground societies. Beneath its vast jungles, the ancient ruins of the trilopeople can still be explored.

Fauna and Flora
The fauna of Felanwn is notable for its myriad molluscs, of many different colors, luminescence and sizes, ranging from smaller than a human's finger to gigantic sizes larger that a castle. Apart from snails and slugs, there are many kinds of crabs and lobsters, with a similar variance of size. In the southern reaches of the cavern, several salamander species roam.

Elves
There are two notable elven tribes in Felanwn. The first is based off the immense shell of a long dead snail; their magic is fungal, and philosophies of spirals permeate their culture. The second tribe built their capital in the shed shell of a gigantic crab, which provides a formidable fortress; their military often uses claw-like weapons in battle.

The elves of the caverns are sabage to a large degree, living in a survival of the fittest environment which would kill them rapidly should they falter.

Knauros
The knauros of Mozarn have established a few colonies in Felanwn, which take the shape of upside-down towers rising from the cavern ceiling, as if great stalactites, shaped by their geomancers. In the towers, they are kept safe from the dangers of the ground, and are granted great sight of the lands below.

An enclave of knauros lives on the ground level itself, rebels and outcasts from Mozarn, who have attempted to create a free society for themselves. In the harsh landscape, they have tamed a number of salamanders, which they use as beasts of war.

Centipeople
The centipeople have a number of permanent groves in Felanwn.

Cults
A poweful cult lives in the southern edges of Felanwn, where they worship the mother of all monsters, Echidna.