Nights of Lights is just one of many side quests in Horizon Forbidden West. It's handed out by Stemmur in Dunehollow, though only becomes available once players have recovered POSEIDON from the old Vegas ruins. As well as rewarding players with experience and skill points, completing the quest is also key to uncovering the secrets that lie behind the mysterious ornaments found in Relic Ruins right throughout the Forbidden West.
Horizon Forbidden West: How to Solve the Isle of Spires Relic Ruins Puzzle
After initiating Horizon Forbidden West's Nights of Lights side quest, players will need to head back down to the Vegas ruins. There, they'll be led to an old casino, where a locked door prevents them from getting their hands on yet another Relic Ruins ornament. In order to open it, they'll need a six-digit door code, which can either be found by solving puzzles elsewhere in the ruins or reading on just a little further down the page.
For those who just want to get on with things, the Nights of Lights door code is 739135. Entering this code will unlock the door immediately; allowing players to grab the ornament and return to Stemmur without needing to explore the rest of the ruins. Anyone who'd prefer to find the code the intended way, on the other hand, is going to need to complete a Relic Ruins style puzzle and find the necessary Datapoints to figure out the code for themselves.
To find the Nights of Lights door code, players should look for a grapple point near the locked door and then follow the staircase up. They'll eventually find themselves in an area with some metal cages and should scan the Malfunction Datapoint directly in front of them when they do. This will reveal that the second half of the code is 135.
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