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The world's core felt relieved.
Despite what it might seem, the invasion occurred near the north pole of Earth, most of such rifts didn't emerge in the south pole, although there were still small ones where feral monsters emerged, they weren't as massive as the ones that Gustav had encountered.
Especially because there was a big difference between some feral monsters and the invaders he had just annihilated with everything he had, the Slarkobs, the Beast World Monsters, and the Celestials.
The World's Core analyzed her surface, as she found that there were no Slarkobs anywhere else than the places where Gustav had killed them, nor Celestials or Elemental Beasts from the Beast World.
Check "The Protagnist's Sister Is Actually the Strongest"!