Tail of Watatsumi
Let’s talk about the Eye of Watatsumi puzzle.
This is located at the southeastern tip of the region. For this puzzle, we just need to interact with the Thunder Bough to gain the Electrograna buff. Then, run and make sure you’re able to go near all five stone cairns. The Electrograna buff should empower them. After this, a few Fatui enemies will spawn, so just eliminate them.
Assuming you’ve completed all the previous puzzles, you should have four Spirit Pearls with you. It’s time to solve the Heart of Watatsumi puzzle in Genshin Impact.