In your search for electroculus in Genshin Impact, you may find that some are locked in certain places.
There’s one electroculus blocked by a steel gate in the Mikage Furnace area of Tatarasuna.
To open it, you need three keys. Here’s how you can get the three keys (location) in Genshin Impact.
Key location 1
All three keys will be inside common treasure chests in the Mikage Furnace area.
You will find the first key at the location shown below, marked by the red circle.
The chest is hidden inside the tower. You’ll get the Key to Some Place.
Key location 2
You will find the second Key to Some Place at the location marked below. Just use the waypoint at the peak and glide down.
The chest is in plain sight, near the broken bridge.
Third key location
The third one is actually at the top of the rooftop in the housing area. You can refer to the location marked below.
To get here, just use the waypoint at the peak and glide to the housing area. The chest is on the roof.
Open the steel gate and get the electroculus
The steel gate is at the very bottom of the area. Just go all the way down and head to the area shown below, marked by the player location.
You should see the steel gate if you’re standing near the water. There’s also a time trial mechanism here.
Open the gate using the three keys and you’ll see a chest. A few Ruin Sentinels will spawn inside.
Open the chest and you should get the Katsuragikiri Nagamasa blueprint. It’s a blueprint for the new four-star claymore.
Take the electroculus inside the cave as well.