It has been a while since Wu Chang left the Peaceful Town Dungeon. Before entering the plane, he and Erin absorbed faith through the Tree of Miracles, which gave him a rough understanding of the events that occurred in the dungeon after he left.
Back then, at the end of the Peaceful Town Dungeon, he took down Jermaine, the Count who wanted to become an artificial deity. After merging the Great Saint Mother along with Erin into the Saint's Legacy Mask, the islanders freed themselves from the shackles of the Seven Deadly Sins.
Including the addiction to the Golden Flying Fish that Jermaine brought them, the cursed transformation into fishmen, and their stiff and stagnant way of living.
The islanders treated the appearance of the Great Saint Mother in the final battle as Erin's rebirth under divine favor. They attributed their liberation to Erin's efforts, transforming their guilt and gratitude into belief, converting the islanders into Erin's followers.
