Erochel is a vast Underdark forest, or fungal, sited in an immense grotto called Sigan-Kûn. Most of this fungal is spread along the shimmering waters of the river Favánë. The mushrooms, fungal stalks, and other flora of this forest are enormous in size, rivaling the size of some surface forests. The magical glow of the Favánë has also led to other unusual plants and lifeforms. Erochel is constantly abuzz with flying insects and critters. The great height and width of the grotto surrounding Erochel is a product of when the Nermanis Sea drained into the Underdark. The onrushing sea bored out a massive area that has become a haven for many lifeforms.

Long ago, as a result of their conflicts with Zandûl-Khâl, the Mulun-Dûna experimented with a race of plant creatures called the Myconid. Mulun-Dûna researchers, mostly those of the Shinszelmoggit family, purchased pixie dust from unscrupulous merchants out of Phalkhîr. This dust was mixed in the canals feeding the myconid's farms. This led to a myconid population boom, and a dramatic increase in Mulun-Dûna's army size. When Phalkhîr learned of what their neighbors were doing, they stopped the trade of their pixie dust.

After a decade of esponiage, the Shinszelmoggits learned the location of this special dust; a product far more powerful than what the pixies of Bal-Kriav produce. They learned it was on the other side of a feywild fuse. We went on to get our own ingredients, even the strong stuff that Phalkhîr avoided. With no experience in the different varieties, we ended up sterilizing our Myconid population, so we replaced them with a much more cunning and stronger variety from the world on the other side of the fewyild fuse. The Shinszelmoggits, no doubt cursed by the gods, saw these new myconids take over as their own masters, leaving us and Mulun-Dûna to be buyers instead of sellers.

- Neblin Shinszelmoggit, alchemist - "The Myconid Solution"