This guide shows how to complete “The Heart of Ouroboros” sub-quest in the Enkanomiya Region in Genshin impact 2.4. This subquest is part of The Subterranean Trials of Drake and Serpent World Quest. Aru will ask you to retrieve three fragments of Reins of Revival, which would then be stitched together with the Golden Bridle. You can obtain one of the fragments in this subquest.
Also Read: The Trail of Drake and Serpent
Go to the Serpent’s Heart
As the quest starts follow the quest marker to the altar in the Serpent’s Heart. Either run past the monsters or eliminate them along the way.
Activate the secret message at the Altar in the Serpent’s Heart
Just outside the altar, you’ll find a mechanism of “of sun and moon” that can switch between Whitenight and Evernight. I have attached an image of it below. Interact with it to set to Evernight. This will cover the altar with a transparent wall with symbols, which you can’t get past from the outside.
Solve the Riddle at the altar in the Serpent’s Heart
After activating the Evernight, enter into the altar and interact with the Investigate spot. This will prompt a cutscene and the symbols on the ground will light up.
Each symbol is marked with dots. These dots indicate the order in which the transparent walls should be activated. All you have to do is to cross the transparent walls from the inside of the altar in the same order as the symbols on the ground.
So walk past the transparent wall with the symbol that matches with one dot symbol on the ground. Come head back inside again, walk past the transparent wall with symbols that matches with two dots symbol on the ground. Similarly, do the same for all other three transparent walls.
If you do it right, you’ll complete the Serpent’s Heart puzzle in Genshin Impact and obtain a fragment for the main quest in Enkanomiya.