The Black Serpent Knights’ Glory is an archon quest in The Chasm area of Genshin Impact.
Your objective is to try and stop the Abyss Order’s plan.
Here’s a walkthrough and guide of The Black Serpent Knights’ Glory in Genshin Impact.
Check the situation at the chamber
First of all, head back to the chamber at the center of the ruins’ summit. You will need to climb back up.
Once you arrive, you’ll see an Abyss Lector activating some mechanism that weakens Dainsleif and the other Khaenri’ah members.
Halfdan stops the mechanism but gets sacrificed.
Defeat the Abyss Lector
After the cutscene, you have to defeat the Abyss Lector. The fight is straightforward but the Lector will create a shield if you don’t defeat it within a short time.
The shield just prolongs the fight.
Destroy all the charging devices
After the battle, you have destroy 4 charging devices.
You will see 4 portals in the chamber. Enter each portal to destroy the respective charging device.
In each area, you have to defeat 2 Abyss Mages first.
Once the Mages are dead, you will be able to melee the device and destroy it.
Do the same for all four portals and devices.
Return to Halfdan
When you’re done, go back to Halfdan at the chamber.
A cutscene will trigger and the quest ends here.