Ten minutes, twenty minutes…

A full half-hour of attacks yielded no results.

"Not right, at this rate, even if we run out of physical strength, there is no way to blast open the boundary, there must be some trick..." said the blood-knife old man.

While he was saying those words.

He was startled to see two figures appear in front of him.

He took a look and recognized the familiar faces.

"Isn't that the Northern Emperor and the Eastern Emperor?"

"Ah...? It's them. But how did they get in? W