Wain decided to stay in this Dungeon because he thought it was the best place to evolve.
Even if many people enter this Dungeon, they were unlikely to make it to the last room of the underwater temple.Ā
After these people enter the Dungeon, they would immediately find themselves in the water. They would have to swim up, and most likely, many of them would die along the way because of an attack by sea monsters. This was one of the reasons why Wain decided to evolve here.
Wain could start evolving in the last hall, but there was a slight chance he would be disturbed here, so he decided. Once he had decided on a location, he gradually dug a small tunnel under the pond. It was complicated, but he managed it in about half a day.
"Great, I can finally get started," Wain muttered and dove into the pond. He swam to the bottom and entered the tunnel he had dug. This tunnel went upward, which caused it to have no water.
