Three days later, the sky changed dramatically. The originally clear sky was replaced by dark clouds, heavy rain poured down, and lightning and thunder roared. The Worm Bay behind them had long disappeared, which also heralded that Boom and his party had stepped into the Devil's Sea, which is known to the world as
It is the dead zone of the "forbidden zone of all spirits".
Millions of years ago, when the human race was at its peak...