In Genshin Impact, chests are a great way to get your hands on easy loot. Chests come in four rarities, the best being the Luxurious Chest. The good news is that there is a secret Luxurious Chest you can find in Mondstadt, and all you need to do to get it is have a good enough balance.
To find the Secret Luxurious Chest, you'll need to complete a hidden challenge near the main area of Mondstadt Cathedral. You can find the exact location shown on the map below.
Go to the point marked on the map below and jump to the end of the wall. A circle of glowing energy will appear in front of you. You need to go through the wall, through the glowing circle, and keep going all the way around the wall until you reach the other side of the circle. There is a timer for each section, but you can do this if you just walk, you don't need to run.
The tricky part is not falling off the wall, especially on the ivy covered sections where it's very hard to see exactly where your feet are in relation to the wall. Once you reach the end, a Luxurious Chest will spawn nearby.
The chest should contain 10 Primogems, 30 Adventure Rank XP, between four and ten Sigils, Mora and random weapons, artifacts, and character XP books. Not a bad pass for a simple game we all played as kids.