In Genshin Impact’s Inazuma update, there is a hidden world quest called Sinister Instruction, and completing this will get you the A Hollow Soul secret achievement. There are many easy to get hidden achievements in Inazuma, though this isn’t one of them. In fact, the very nature of this quest makes it very easy to miss, as the majority of players most likely will. To make sure that you are not one of these, be sure to read our Hidden Genshin Impact Quest Sinister Instruction and Secret Achievement guide.
How To Solve The “Sinister Instruction” Quest and Earn The “A Hollow Soul” Achievement
To begin this hidden world quest, first head on over to Serpent’s Head. We’ve marked the exact location of where you need to go on the map below. Here, you will see Washizu the samurai. He is seated next to a shrine. Go up to him and try talking with him. He will tell you to pray at the shrine three times. So, go to the shrine right next to him and do just that. This shrine is called the Outsider Shrine. Pay your respects at the shrine three times. Each time you do so, a purple orb will float on up from the shrine. Speak with Washizu again. He will tell you that you should wait until tomorrow. Please note that this means that you will have to wait a day in real-life, not simply advance the time in-game.
After a day, return to this location and you will see an Exquisite Chest. Loot it and speak with Washizu again. He will tell you to repeat the entire process again. Pray at the shrine 3x, talk with Washizu and wait until tomorrow again. Like before, return here and loot another chest. Do everything as before. However, after you have prayed three times this time, Washizu will now attack you. After he dies, he will drop the Incomplete Notes. These instruct you to find Washizu’s lost possessions in nearby Higi Village. Finally, go to the village. The area where you have to look for this is highlighted and when you reach the exact place – between the two torches in the screenshot below – you will get the option to dig. You will dig out an Exquisite Chest. Loot it and you will automatically earn the A Hollow Soul secret achievement.