This is also a unique product within a world, the structure of that world is somewhat strange, having both real and illusory sides, and there is no place like Hell, or rather, Hell is just the illusory side.
Dream Dust belongs to the unique products produced in the region where the two realms intersect. In that world, things between the two realms can mutually transform.
The Dusk Organization has conducted some tests. There's no problem when entities from the material realm leave that world, but once something from the Dream Realm leaves the world without undergoing the material realm conversion process, the parts involved will turn into dust.
Similar to soul fragments and the like.
But beings such as creatures directly turn into souls, and once they return to that world, whether in the material realm or the Dream Realm, they become mismatched entities.
