Right under all the puzzles that you finished on the second floor, with the orientating devices, you’ll go into just a very simple and basic thing. That is why people are having a problem with this questline and overthinking about it a lot. You will not have to do anything like a puzzle! Just follow this guide on Look For A Place To Leave Hints and you’ll see.
Look For A Place To Leave Hints – Genshin Impact
This is a very simple one. You will have to just explore around the area where you are at and then find this specific place next to the wall. Make sure that you explore only the first floor, or the one under the big open area that you were in before.
It is going to be right next to the big room with the small totems inside. No, you do not need to hit those totems at all! Just locate where this shiny area is and that is it!
You will also need to be on the first floor because it will be located under the big open area that is above. Interact with it and the quest will be finished. Congratulations!
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