Underrealm

This realm is a creature just like High Heaven. The Underrealm otherwise known as the Abyss. Its origins are unknown even Time and Knowledge don't know. It lived as a perfect creature in terms of survivability. It could adapt to any environment or enemy faster than the speed of sound. This ultimate life form had no soul unlike every other creature, this was its weakness that prevented it from consuming everything in the realms. Knowledge created a soul for the monster. Without its soul having a defined structure or shape, its body collapsed into a pile of ooze. Interacting with this ooze is often deadly. The ooze acts as a teleportation method to the Underrealm.

The Underrealm is the stomach of the Abyss. What lives there is an attempt to recreate a corrupted version of another realm, in particular the Realm of the Mortals.

"I got goo in my shoes, I tried to clean it but I could never get the smell out. They were my favorite pair too. Watch out for the ravenous monsters too." - Anthrax