Overcoming Dangers

Exploration Stage: River of Oblivion
From: Salem
Description: In the Serpentine Waters, gloom and darkness are constantly thickening around you, so it’ll be difficult for Charon to see anything. But I’ve read about rare stones mined from the abyss itself. With them, we can destroy the veil of darkness. Can you help me find some of these stones?
Completed: Incredible, you managed to find the abyss stones! I can only imagine what dangers you had to overcome in order to get them. While you were looking for the stones, I found out how to dispel the murk with the help of these stones. You just need to lay them out in a special way, like this...