ON THE FLIPSIDE, shadow monsters are just twisted desires, born from the collective consciousness of humanity. They take the form of monsters that are commonly stored in myths that the general populace believes in. For example, one of the shadows you can fight is a representation of the god Thor. Go right ahead and kick their butts.

You can destroy those, but as long as there are twisted desires and the thoughts are out there, they can be reborn and resurface in the metaverse.