Screenshot by Creamofgames
There are an array of hidden objectives players can find in Teyvat, one of which lives on Watatsumi Island. In the area surrounding Sangonomiya Shrine, you will come across strange pirate symbols that resemble an Oni.
Discover their secrets to earn a whole bunch of chests, including an elusive valuable chest.
Screenshot by Creamofgames
Start by heading southwest from the village of Bourou to the location shown above. There you will find a cave with a makeshift table and something shiny on it.
Interact with the shiny object - Treasurer's Notes - which depicts a person named Rinzou who is said to have hidden treasures across the island and marked their positions with symbols. This will initiate the hidden objective: find those symbols and collect the treasures below!
Related: Contemplating Three Thousand Miles Away Genshin Impact Quest Guide
Screenshot by Creamofgames
In total, there are eight pirate symbols scattered across Watatsumi Island. Their locations are circled in the image above. Upon discovering them, you want to search for a nearby Dig interaction. It will spawn a common chest.
Screenshot by Creamofgames
Unfortunately, not all pirate symbols will contain a chest, because the treasurers beat you in some places. They will still cause dialogue interactions with Paimon, so be sure to visit all eight locations.
Screenshot by Creamofgames
After interacting with the eight pirate symbols, head to the area northeast of Sangonomiya Shrine and southwest of Suigetsu Pool, to the area marked with a circle above.
There you will come across pesky treasures guarding a locked chest. Defeat them to unlock the Exquisite Chest, which you must interact with to obtain a hidden quest item: Rinzou's Letter. The letter details the experiences of the legendary pirate, Rinzou, as he retired from his treasurer lifestyle.
After getting the letter, return to the cave southwest of Bourou Village, where you originally found the Treasurer's Notes. A new Dig interaction will appear in front of the fortune table. Interact with it to spawn a valuable chest.
Completing this hidden objective will unlock the achievement A Distant Sea Shepherd's Treasure.
Take this opportunity to further explore Watatsumi Island by checking out our guide on How to Farm Sango Pearl in Genshin Impact.
