The world of monsters is a place of wonders and secret places that contain various abilities.
In this work of mine, one of these places is represented. It's Called The Cave Of Parallel Realities. This cave looks ordinary, except for the luminous portals (there are three of them in the picture, but there are others, this is only a small part). This cave can use portals to transport the monster to another reality: the Reality of the Living Dead, the reality of exchanging superpowers, and many others, where everything seems normal, except for the appearance of monsters.