The Treasure Lost Treasure Found quest in Genshin Impact is the one you can find in the Guili Plains. You want to tell Soraya about it, who can find large ruins in the area west. Soraya will tell you about her curiosity about how many secrets Liyue holds, and the secrets specifically being the inscriptions on Guili's Coven, which are the ruins she is immediately next to when you find her. The quest is to help Soraya in her search for the location.
The first task is to go inside the Guili Coven and search five stone tablets. A quick way to find all of their locations is to open the quest menu, go to Treasure Lost Treasure Found, and click Navigate at the bottom. Click on it to show the areas where you can find these tablets, which makes finding them much easier. Once you've found them all there, head back to Soraya. She can share all the translations made on each of the tablets.
Then you need to go west, next to Luhua Pool, to look for two more stone tablets. Like last time, you can use the navigation aid to locate the area where the two tablets rest. However, since you activated it at the start of the quest, it should still be. These two objects are much further apart. The first is near Luhua Pool and the next is south of Guili Coven. Again, return to Soraya once you have both.
Jade plate location 1
Soraya wants to take some time to rest. Return to the Wangshu Inn, which should be north of your current location. Soraya then shares her findings and wants you to find four jade plates. These are not hidden everywhere in the region. Fortunately, the former is not too far from your location at the Wangshu Inn. It's to the south, which you can reach by jumping near Soraya and then gliding towards her. The location is guarded by several slimes that you must defeat before you get the plaque.
Jade plate location 2
The next jade plate is near where you found the second stone tablets, near Luhua Pool.
Jade plate location 3
The third jade plate can be found south of the Guili Assembly, next to the area waypoint.
Jade plate location 4
The last jade plate is slightly northeast of the Guili assembly area, right next to the Yaoguang Bank. After taking the four jade plates, return to Soraya at the Wangshu Inn.
You must now find the final ruin of the quest. Its exact location remains a mystery, but we've helped pin it down for you. It is north of the Guili Assembly, right in the middle of the Guili plains.
You have to fight three Ruin Guards when you arrive after activating the stone in the center, so you can expect to spend some time dealing with them. After defeating them, return to Soraya to complete the quest and earn your rewards.
