439. Mother and Daughter_2

Invading another world is indeed a technical task.

Just as a normal family's doorway will have a door to prevent theft, worlds also have what you might call a "security door."

The periphery of a world is generally protected by a layer known as the "World Barrier." In most cases, anything from another world that hasn't received permission to enter is blocked by the World Barrier and cannot make it inside.

Moreover, the function of the World Barrier isn't just to prevent invasions from the outside; it also acts as protection for the world itself.

Once the World Barrier is breached, the unprotected world could be eroded by the endless void, plunging directly into an apocalyptic end.

This is also why the Lord of Glory cannot descend in His true form—His power could shatter the "door" in an instant, but then He would only obtain a broken ruin of the apocalypse, which really isn't worth it.