The Battle of the Black Trap and the Inversion Tide.
To be honest, Gawain never expected to hear such a shocking ancient mystery in a casual chat with Sea Demon Tiel. But upon reflection, he realized that if there was anyone in this world who could provide historical accounts older and more detailed than those known to him, the satellite spirit, it would be these deep-sea saltwater fishes that have been observing the land since the Ancient Era.
What exactly is the so-called Black Trap…?
According to Tiel, it seems to be a filtering mechanism or a "reaper mechanism" that harvests civilizations according to a fixed standard. Every land-based civilization since the Ancient Era has been destroyed after reaching a certain level of development—destroyed by the chaotic wave or that mysterious "Black Trap". This fact is chilling.
However, Gawain also understood that even if the Black Trap existed, human beings could not stop progressing.
Because there is also the chaotic wave.
