Horizon Forbidden West: How to Solve the No Man's Land Relic Ruins Puzzle

gamerant.com:

There are eight Relic Ruins scattered throughout the world of Horizon Forbidden West. These dilapidated structures serve as poignant reminders of the Old Ones' fallen civilization and are home to a set of special relics known as Ornaments. Getting hold of these ancient trinkets is no simple task though, as players will discover following their arrival at the No Man's Land Relic Ruins.

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Horizon Forbidden West players will soon realize that there are no obvious means of entry, save, perhaps, for some mysterious red crystals that are growing on some of the building's exterior walls. Even after learning what to do with these crystals, players will still need to get their hands on a fully charged Energy Cell and then figure out how to get it across a pool of water without it getting wet.

Though players will be able to explore the exterior of the game's second Relic Ruins almost immediately after they've entered No Man's Land, they won't actually be able to head inside straight away. Before they can do that, they'll first need to learn how to destroy the mysterious red crystals, which happens a little later on during the Death's Door main story mission.

After crafting an Igniter and finishing the Death's Door mission, players can then return to the Relic Ruins, where they should look for a moveable crate. They'll want to push it over to the yellow climbing beam on the south side of the structure and then make their way up to the roof. There, they'll find a patch of Firegleam crystals which they can ignite by holding the R2 button for a few seconds.

Once the exterior wall has been destroyed, players should head inside and take stock of their surroundings.