Defeating the Black Serpent Knights is important if you want to unlock the mysterious room in the nameless ruins. The Black Serpent Knights will be dropping Orb of the Blue Depths, which is a key item in the puzzle.
This guide will show you where you can get the Miner’s Key in the Chasm.
Miner’s Key Location – Genshin Impact
So you are on your path to collecting all of the Orb of the Blue Depths and defeating all the Black Serpent Knights.
One of the Black Serpent Knights, however, will not be accessible because they are inside a room with a locked gate.
The Black Serpent Knight inside this room is called Skeld, the Augur of Mirrors.
To open the gate, you need to get the Miner’s Key. Start by using the teleport waypoint in the Serpent’s Cave and head northeast to the area on the map above.
Follow the path with the circular gears surrounding it until you see small gears on the ground. Investigate all the small gears you find lying on the floor until you get the Miner’s Key.
Once you have the Miner’s Key, you can unlock the gate leading to Skeld’s room.
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