The Great Annihilation was the turning point for all history in this world and also marked the beginning of the so-called "Deep Sea Era."
Thanks to Nina, Duncan finally pieced together a rough understanding of the catastrophic changes that once occurred in this world and realized that this world had not always been as strange and dangerous as it is now—
According to historical records, the world before the Great Annihilation was a prosperous and safe paradise.
Back then, the ocean was not the "Endless Sea," and the limited seas did not cover over ninety-five percent of the world's surface as they do today. Back then, humans lived on vast and safe lands, and even the seas were free of dangerous phenomena like the Spirit Realm, Subspace, and the like.
