Complete The Origin of the Lanterns.
Brother Qian from the Liyue Adventurers’ Guild is inviting people to play a certain game…
1.Talk to Brother Qian
2. Try the Illumiscreen
3. Complete Illumiscreen: Glaze Lily
4. Find the treasure area indicated by the Illumiscreen
Talk to Brother Qian / Complete Illumiscreen: Glaze Lily
Accept the quest from the Event Section, then speak with Brother Qian who can be found down on the Liyue Harbor. After the conversation has come to a close, turn one of the lanterns, then speak with Qian again to get a more in-depth guide on the puzzle. Now position the lanterns until a Glaze Lily is shown on the board, then observe it to find out the treasure locations.
You’ll now want to go to the three blue markers and defeat the enemies before opening a chest under a tent in Sal Terrae, outside a Waterfall in Wuwang Hill and inside a cave at Mt. Aozan. Finally, return to Qian to complete this quest.