Horizon Forbidden West: How to complete the Relic Ruins in The Long Coast

Horizon Forbidden West's Relic Ruins: The Long Coast is located north of Thornmarsh on the west side of the map. To finish Relic Ruins: The Long Coast, you must explore the ruins, solve all of the puzzles, and recover the hidden treasures. You can climb up onto a platform inside the ruins by going to the eastern end of the north wall. From there, acrobatically make your way along the east wall, dropping off the yellow rails at the end. Ignite the Firegleam, then turn around and go through the hole you just made.

Pull the switch to the south with your Pullcaster, then grapple up to the old light that emerges above you and touch Circle to leap to the platform opposite before the light circles back around the rail. It can take a few tries before you get it right the first time.

Grab the crate and lower it through the platform's hole. Now drag the crate all the way over to the ancient elevator in the southwest corner of the ruins. To pull it through the water and over a high-ish drop, you'll need to utilize your pullcaster. Place the crate in the elevator, then exit the elevator and ascend the northeast stairwell. Remove the energy cell from the old door at the top of the stairwell, return it to the bottom, and place it in the socket outside the elevator.

Ride the elevator to the upper floor by pressing the button on the interior of the elevator. Pull the container out of the elevator, then release it and go around the outside of the elevator to the south and west. Aloy will spot an Ornament if you climb up the building's corner. To activate your Shieldwing, go around to the northeast corner of the tower and jump off to the east. Land at the second crate and launch the Firegleam up the west slope. Push the container up the slope and through the hole created by the Firegleam, then down the higher floor's edge.

Drop to the ground floor and summon the elevator back up. Do not press the elevator button; instead, push the crate inside the elevator. Instead, return to the elevator and push the first container through the doorway, allowing it to rest on top of the elevator. You should now have one box inside and one on top of the elevator.

Return to the elevator and press the button, then use your pullcaster to pull the hatch from the ceiling. Climb onto the container and jump to the yellow handholds to the west after jumping up through the hatchway. To obtain the Ornament and accomplish Relic Ruins: The Long Coast, climb up and then jump to the platform.