All those traitors who were fishing in that river got caught by Darian and Niara. After checking their spatial rings, they found that each of them had at least a dozen crystals. To have gathered that many, it was likely those traitors had arrived in the World of Life many days ago.
Inside their rings, Darian also found a set of inscriptions marked with Celestia Academy's power. These items were the Summoners' ticket out of that place.
When their companions' thirty-day stay in the universe ended, they'd use those inscriptions to leave all at once. That was the only way to exit that world—by being transported directly to a secret location, where the academy's High Elders would burn resources to bring them back to the galaxy.
Everyone from Celestia Academy had one of those items. Those who came without knowing the truth probably got hunted down and killed before they even realized what was going on or tried to escape.
