Genshin Impact 2.6 introduced The Lost Valley, which is a brand new domain that drops the Vermillion Hereafter and Echoes of an Offering artifact sets. However, this domain isn't available for players to just waltz right in; instead, they must complete a very short puzzle beforehand.
It can seem cryptic to the average player, but they should know the following:
The whole process should take approximately a minute of the player's time. After that's done, proceed to the domain to unlock it to teleport there in the future.
A little bit south of The Lost Valley domain is a location with two torches and a chest. There are some enemies here, but the important part is that Travelers place two Geo constructs in front of the torches here (as shown in the photo). It's a little bit south of the 'F' in Fuao Vale on the map.
Once that's done, the player must now head southeast to a location with a glowing rock, which can be seen below.
The player must now place a Geo construct on the rock. Paimon will remark about the ground shaking, and they will get "The Lost Valley" achievement in Genshin Impact. They can now proceed to the domain's location, with the entrance being slightly northwest of the first location where players used Geo constructs.
Genshin Impact players only have to go through the cave for a short bit before spotting The Lost Valley domain. From here, simply approach it and interact with it to unlock it permanently.
There are four levels for Genshin Impact players to consider in this domain, but only the third and fourth ones give players 5-star artifacts. The two 5-star artifact sets are Vermillion Hereafter and Echoes of an Offering, both of which are brand new as of Genshin Impact 2.6.
The enemy lineups in these two levels
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