The Sealed Tunnel in Elden Ring is one of the minor dungeons in the base game and can be found on the Altus Plateau. At the end of the dungeon, you can battle a miniboss, Onyx Lord, and collect its weapon, Onyx Lord’s Greatsword. This weapon can be quite effective in the Shadow of the Erdtree DLC.
In this article, we have shared all the location details and walkthrough tips for the Sealed Tunnel in Elden Ring.
How to find the Sealed tunnel in Elden Ring?
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Follow these steps to locate the Sealed Tunnel in Elden Ring:
- Start the journey by going to the northwest corner of the Minor Erdtree church. It's at the Altus Plateau.
- Look for a water body below.
- Descend the slope towards the water.
- Go straight to the southern part of this water body.
- Search the western cliffside for an entryway - this is the Sealed Tunnel.
- Enter the small tunnel to find a Site of Grace.
Once you enter the Sealed Tunnel, get ready for a miniboss boss fight and platforming.
Guide for exploring the Sealed Tunnel in Elden Ring
Follow these steps for the entire walkthrough of the Sealed Tunnel in Elden Ring:
- From the Site of Grace, locate the western wall left of the brazier.
- Strike this wall to reveal a hidden passage.
- Enter the cave filled with Stonediggers.
- Defeat the Stonedigger on your right.
- Ascend the wooden steps around the central column.
- There's a corpse with a golden rune.
- Drop down and be wary of a Vulgar Militant behind the platform.
- Check the corner for a chest containing the Miner's Bell Bearing.
- In the southeast, defeat four Stonediggers mining Cracked Crystal and Smithing Stone deposits.
- Return to the chest in the southwest corner.
- Attack the wall right behind it. This will reveal a new path.
- Follow the tunnel to a lift. After that go down.
- Go straight as usual until you reach the dead end. Strike the wall to go forward.
- You will find another corpse in the next dead end, loot it for Gold Runes.
- Reveal another hidden wall behind the corpse.
- Enter the larger cave and cross the branch.
- Drop onto the lower left branch to find a Gold-Pickled Fowl Foot.
- Head southwest to the wooden platform.
- Enter the left tunnel and defeat a Vulgar Militant guarding a Stonesword Key.
- Return to the branch and descend.
- Fight off Vulgar Militants and a Pendulum Statue.
- Collect a Somber Smithing Stone (5) in the northwest corner.
- Loot all three corpses.
- Climb the ladder and cross the branches eastward.
- At the blocked staircase, drop down on the right.
- Avoid exploding Abnormal Rock Clusters.
- There's a corpse under the stairs that you can loot.
- Ascend the stairs, watching for more Clusters.
- Loot a corpse for Old Fang x2.
- Find Large Glintstone Scrap x3 on a corpse up the northeast slope.
- Locate barrels in the southeast hiding another Cluster.
- Reveal a hidden wall behind the Cluster.
- Descend via branches and platforms, collecting a Smithing Stone (5).
- Make a running jump to reach the high root. Here you can find some lightning Grease.
- At the bottom, avoid four Clusters and loot a Golden Rune (9).
- Follow the tunnel to a stone archway leading to the boss arena.
- Enter the arena to face the Onyx Lord.
- Defeat the boss to obtain the Onyx Lord's Greatsword.
That’s all for the Sealed Tunnel in Elden Ring. Other than the boss weapon, this dungeon gives a lot of useful loot such as Smithing Stones, Gold Rune, and more. We highly recommend visiting this location whenever you are in the Altus Plateau.
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