From this page of the Horizon Forbidden West guide, you will learn how to get the Gizmo ornament.

These Ruins are part of the side quest, Nights of Lights.

To be able to start this quest you have to first completeThe Sea of Sands.

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These Ruins will only unlock after talking to a man.

After accepting the task, you have to jump down to the previously underwater area.

In this area, you will also find theDunehollow.

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The Ruins are marked on the map.

You only have to reach it.

However, if you’re free to’t locate them look for opponents.

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There aren’t too many of them in the area, and several of them are around the Ruins.

you’ve got the option to complete these Ruins without any exploration.

The door behind which the Ornament is is available at the very beginning.

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You don’t need any key, just the code.

you’ve got the option to jot down it without searching the ruins.

The code for the door is739135.

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However, if you decide to explore the place, you will mainly manipulate the crates.

Right at the start you have to pull one of these out.

Push the crate onto the wooden platform.

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Don’t worry, Aloy has enough strength that she can do it without a problem.

The next step will be to pull out more crates.

The first one is hidden behind a metal wall.

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You will see a gap where you’re able to throw the hook and move the crate.

It’s time to get another crate.

Use the hook to make it fall to the ground.

Then drag it to the area under the wooden platform.

When it is placed, push the box off the platform onto it.

Push the two crates against the wall with a metal grate.

Climb to the top of them and then jump to the other side.

There you will see a ventilation shaft that you might use to get outside.

This way you, will end up in front of the ruins.

You will get at the door again.

Enter the code -739135.

You’ll learn it by exploring the ruins and examining datapoints.

Behind the door, there is an ornament waiting for you to pick it up.

This time, taking it won’t complete the task.

You still have to go back to the man and talk to him.

You should ascend the mountain in the same way you descended.

You cannot use fast travel in this place.

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