Teratoma World is a disturbing world accessible from the orifice in the Red & Blue Passage.
Features
This world features fleshy, mutated organisms lying around, surrounded by trails of blood. Using the Seer effect will reveal lanky figures standing around the place. Directly above the entrance is a creature with many eyes and red lips. Interacting with it will give you the Mouth effect.
Directions
Kubotsuki's Nexus → Nail Board → Red & Blue Passage → Teratoma World