Finally!

The next day.

After eating breakfast, Zemeth, Jegun, Ramza, and Agran went back to the ruined castle while the rest of the men continue recuperating on the island.

When the men arrived at the lake, they were surprised to see that the black water was gone replaced with murky water. And there was no trace of flames on the surface of the lake.

"This is amazing! I can see the water of this lake turning clear in the coming days," Jegun said confidently.

Agran looked at Jegun. "Grandpa, why does the water turn a bit lighter today while yesterday it's so black," he asked.