Underworld

The Underworld is a series of giant caves under the surface of Vyraj.

Description
The cave is extremely wide, about 16 miles wide at average, and 6 miles tall.

It contains unique flora and fauna. Most of the flora include giant glowing mushrooms reaching up to 200 feet, and lichens the same size as conifers. Regular plants such as deciduous trees and grasses exist in the underground, but they are not as common as fungi and lichen.

As for the fauna, giant butterflies are dominant among most creatures. Their wingspan may reach up to 12 feet, as large as an albatross. Some have reached wingspans of 24 feet. There are "Bullet Tails", giant springtails, and fireflies.

Hellhounds also exist, they are massive animals which are canine by nature, but have some body parts found on crabs (walking legs may be found on the animals' heads, they are covered in a chitin-based armor.)

Glow worms dot the roof of the caves. They may be 20 feet in length, and may vary in colors including but not limited to; blue, white, yellow, purple, and red. Most of them are a light blue.