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 Nazgarun experimented with a race of plant creatures called the myconids. Nazgarun researchers 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 Nazgarun's army size. When Phalkhîr learned of what their neighbors were doing, they put a stop to the sale of pixie dust.

After a decade of espionage, Nazgarun learned of the location of the special pixie 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. This feywild fuse happened to be in Phalkhîr territory, so Nazgarun used the Underdark to reach it. Nazgarun procured all manner of pixie dust, some of which Phalkhîr tended to avoid due to its dangerous nature. With no experience in the different varieties, they ended up sterilizing their myconid population. Nazgarun replaced them with a much more cunning and stronger variety from Kriav. Unfortunately, these new myconids were not easy to keep as soldiers, proving to be more independent-minded.

- Neblin Shinszelmoggit, deep gnome alchemist - "The Myconid Solution"