Sinister Instruction is a hidden world quest that has to be unlocked in Inazuma.
Your objective is to find Washizu’s lost possessions in Higi Village.
Here’s a walkthrough of Sinister Instruction in Genshin Impact.
How to start the quest
To begin the quest, you must first find Washizu and the shrine. The location is shown in the map below, marked by the player location.
It’s in Serpent’s Head, just northwest of Maguu Kenki.
You might have heard of this shrine because you can get free Exquisite Chests daily for three times.
To get the chest, you just need to come to this shrine every day (daily reset) and pray to the shrine. Pray three times and you’ll see three energy balls on the shrine.
Then, talk to Washizu.
Repeat this process for three days.
On the third day of receiving a chest, pray again and Washizu will become enraged.
Defeat him in battle.
Find the possessions
After beating him, look for his possessions north in Higi Village.
The location will be marked on your map.
At the village, you’ll see a few houses. Behind one of those houses, you’ll see two torches.
Dig the area and you’ll find his possessions. The quest ends here.