A gigantic yet sometimes claustrophobic cave system with varying levels of limited light and an increased quantity of cave-based creatures and many other subterranean monsters, with the diet of most life forms in this level consisting of meat.

There is an odd circumstance on this floor with a seemingly water level that may appear at random from another level, which could worsen the life for Hunters or benefit depending on the situation.

Some minerals in this cave system may have some good value for Hunters and other people with their interesting properties, while some others may be dangerously volatile or life-threatening.