The Scale Void Realm is a special space that has existed in the Demon Realm since ancient times. Anyone who enters this place would have their cultivation suppressed completely. Furthermore, those at the Zenith Heaven stage and above would have no way of entering this place.
It is a space created by an ancient Dao Ancestor. That senior set up such strict rules in that space, and it was precisely because those rules were so unyielding that they destroyed the balance of the Great Dao of Heaven and Earth in that place, causing the place to be so desolate