Arthur looked around the forest for another prey, but his battle scared them away. Most of them ran back to where they came from, portals that remained open between Alka and Earth. Although he wanted to close them down, he did not possess the Isotox like in the alternate timeline.
The only way to close a dungeon is to destroy its core before it connects to the other world. If a dungeon is cleared, no monsters will respawn there, and it would be nothing but a passage that could be closed. However, if a dungeon breaks, its core becomes a part of the world, and it would be impossible to destroy it.
This is why Arthur created Ascent: to clear the dungeons with the highest chance of breaking. The efforts of his guildsmen would delay the apocalypse, where the split would be undone, and every dungeon gate in the world would break open simultaneously.
