Initiate Rainbow Bladework and fight using an illusory sword rain, while creating the maximum number of Rain Swords.
These effects carry over to other characters.
Puzzles, Secrets, and Hidden Chests in Liyue
Ragged Records Hidden Quest Guide
Puzzles, Secrets, and Hidden Chests in Dragonspine
Violetgrass Farming Map
Treasure Lost, Treasure Found Quest Guide
How to Farm Character Ascension Materials