Genshin Impact : Echo of an Ancient Chord

To obtain Echo of an Ancient Chord, you'll need to challenge the Echoes of the Deep Tides Domain located in the Court of Fontaine region. There is a chance for you to be rewarded with Echo of an Ancient Chord by successfully challenging the Domain of Forgery: Robotic Ruse at level IV or higher. It's only open on Mondays, Thursdays, and Sundays. The recommended party level for the Domain of Forgery: Robotic Ruse IV is 80. It's recommended to have Hydro, Pyro, Cryo, and Anemo characters in your party, but they are not required to complete the challenge. The Domain features the following Ley Line Disorder: After a character triggers Hydro-related Reactions, all party members will be granted a Hydro DMG Bonus. As such, place Hydro characters in the party to defeat your opponents more effectively. After challenging the Domain, collect rewards using 20 Resin. You can also receive double the rewards by spending one Condensed Resin. The Echoes of the Deep Tides is located in the Court of Fontaine. Refer to the image below for its exact location.