A Friend in the Dark is a Side Quest in Horizon Forbidden West: Burning Shores which you'll come across as you progress through Relic Ruins: Murmuring Hollow. As part of our Horizon Forbidden West guide, we're going to explain everything you need to know about A Friend in the Dark.
For the purposes of this walkthrough, we will assume you have completed Relic Ruins: Murmuring Hollow, as it's during this section that this Side Quest presents itself.
You will hear a voice coming from behind a locked door in the ruins. Approach the door and Aloy will reassure the person that she'll help them escape. Opposite this locked door will be the other door you opened to solve the Relic Ruin. Go through and there's another locked door. This one requires a battery to open.
Go back out and head left towards the wrecked train cart, which has a live battery in it. Remove the battery, then return to the battery door and insert it in the slot. In the next room is a Key Module — pick this up.
Return to the locked door with the stranger behind it. Insert the Key Module into the console and the door will open. Watch the cutscene.
After speaking with Gildun, follow him into the passageway. Follow it all the way down. Look out for a small room on the left, which contains the Datapoint 'Dead Wait'. It contains a code you'll need later.
Continue down the corridor to find some Brimshine on the right. Just ahead is the locked door you need to open. Use the code from the Datapoint.
The code for this locked door is: 117. You'll learn this from the Datapoint 'Dead Wait', which is located in the tunnel as you descend.
Once the door is open, head inside. Across the room is another locked door.
Go left down some steps to the lower level. Over on the right
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