The second one is on the other side of the barren sea. It needs to ignite several squares of thunder elements. There is a problem, a strange challenge. After solving the puzzle, you will enter the circular pillar behind the tree, scan the fox with a mirror, and a square flat plate will appear. Then touch it, and you will enter a secret room and decrypt it according to the image.
3. The fourth location is in the tidal flat, but first, the fox statue should be lit with lightning on the tidal flat at the bottom of the compound (just next to the bottom of the compound, but not across the river), and then the fox statue should be scanned with a mirror, entered into the secret room, and decrypted according to the image.