There are three secret locations in Genshin Impact’s Frost Moon region where you can trigger secret Moon Sisters cutscenes that show some of the old memories. However, they’re locked behind some puzzles and mechanics, and unlocking all three memories will give you a bunch of chests and the Immaculate Eternity and Threefold Transience achievement.
This article covers all three Moon Sisters locations in Frost Moon and briefly explains how to trigger the memories in Genshin Impact.
Genshin Impact: All three Moon Sisters locations in Frost Moon
Moon Sisters location #1

Head to the Golden Hall, southwest of Archaeolune Storm Research Center, and defeat the Frostnight Scion. Once that is done, interact with the glowing aura-like thing beneath the floating rock.

Doing so will summon a boat, and you must sit on it. This will trigger a cutscene and play back one of the Moon Sisters’ old memories.

Once the memory ends, you’ll be back at the Golden Hall, and you’ll get two Exquisite Chests and one Luxurious Chest reward.
Moon Sisters location #2

Go to Bubble Pool and approach the boat in the pool. This will trigger some prompts, and you’ll get an objective called The Unidentified Vessel.

You must enter the Floating Ooze and wait for it to go higher. Once you’ve reached a good altitude, you must get on the back of the Moonglow Frostfin Whale, which will take you even higher. Finally, you must get on the ship and sit on it to trigger the second memory of the Moon Sisters. Completing the cutscene will give you a Precious Chest.
Moon Sisters location #3

For the final location, you must first max out the Nuur Stone Circle meeting point. Doing this will remove the seal on the giant tower. Next, enter the tower and take the lift down. Finally, interact with the glowing spot near the teleport waypoint to call the ship and ride it to trigger the last old memory of the three Moon Sisters.
You will also unlock the Immaculate Eternity and Threefold Transience achievement.
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Edited by Hijam Tompok