Hidden deep beneath the island’s mysteries lies the gold arm door – a barrier few manage to pass. This guide reveals what you need, where to go, and how to open it to reach the game’s most secret chamber.
Heads up: Make sure to save before progressing through the gold arm door because, depending on which ending you choose, you may or may not be able to continue playing afterwards.
Required materials for opening Sons of the Forest gold arm dor
To open the gold arm door in Sons of the Forest, players need the Maintenance Keycard to access the relevant bunker, along with Golden Armor obtained inside from a lounge area couch. A blueprint located next to the door requires Wires (4), Bones (33), Golf Cart Batteries (4), Skulls (1), and Stones (25) to build an Armor Plater. Place the Golden Armor and Solafite ore in the plater to upgrade it to Ancient Armor, which equips automatically to unlock the door upon interaction.
To open the gold arm door in Sons of the Forest, you need the following materials:
- Maintenance keycard
- Golden armor
As always, prepare yourself with healing items and weapons as you’ll fight against many enemies inside the bunker.
How to open the gold arm door in Sons of the Forest
To open the gold arm door, you first need to equip the Golden Armor set, which you obtain late in the story by exploring key bunkers and using the appropriate keycards. Travel to the bunker on the far eastern coastline, head inside using your maintenance keycard, and follow the interior corridors and stairways until you reach the lounge area with a bathroom that leads into a cave. Move through the cave system until you reach the gold door with the arm imprint, then approach it and interact so your character raises their armored arm and forces the door open.
- Travel to the eastern shore of the island which is across the mountains from the starting area.
- Use your GPS to spot the location of a bunker along the shore. If you’re having trouble finding it, use the image above for guidance.
- Enter the bunker using the maintenance keycard, and proceed down the stairs.
- Go inside the open doorway at the bottom of the stairs, and move straight ahead to find another set of stairs.
- Head down the stairs, and continue through the open doors.
- Turn left and proceed down the corridor. If you’d like to save your progress, turn right instead to find a room with a bed.
- Follow the pathway and enter the first open door on the right.
- Continue ahead to find a large room with a bar and a fireplace. If you gave your shotgun to Virginia to use, grab another shotgun on the bar counter.
- Explore deeper into the bunker to the bathroom.
- Go through the hole in the wall that is covered in smoke to find a cave system with a gold door with an arm imprint in it.
- Interact with the door to open it, and proceed to the ending of the game. Make sure to save before progressing through the door. Depending on the ending you choose, you may or may not be able to continue playing.
Where to find Golden Armor and required keycards
The Golden Armor in Sons of the Forest is located in a luxury bunker on the west side of the island, accessible after obtaining three keycards in sequence.
Maintenance Keycard
Dig up the bunker at the green circle on the riverbend in the northwestern map area (south of the beach river) using the shovel. Enter the bunker, and find it on a table next to a 3D printer and laptop in the first room.
VIP Keycard
Use the Maintenance Keycard at the Food Bunker cave (green circle north of the large lake near the beach, by two golf carts). Proceed through flooded rooms to a control area with monitors; it’s on a desk there.
Guest Keycard
Head to the Residential Bunker cave on the western side (blue pulsing marker with TV icon between ocean and snowy mountains). Use Maintenance Keycard on doors, navigate to the nightclub area upstairs, and pick it up from dead bodies in a booth.
Golden Armor Location
With all keycards, go to the opposite (western) side of the mountain range to a green-marked luxury bunker. Use keycards on readers to access deeper levels; after a cutscene, find the Golden Armor (now called Ancient Armor in updates) in a final room. Bring weapons and the shovel for mutants and obstacles.
Detailed steps to get Maintenance Keycard with shovel
To get the Maintenance Keycard (Carl Planter’s) in Sons of the Forest, first ensure you have the Shovel, obtained from a challenging cave requiring the Rebreather and Rope Gun-check your GPS for the orange pulsing “M” marker northwest of the snowy mountains, near a riverbend south of the beach spawn.
Exact Location
Travel to the northwestern map area where a green circle appears on your GPS (river crossing with dirt path). Look for two abandoned golf carts overgrown with vines and surveying equipment nearby-the dig spot is the obvious dirt patch encircled by them.
Step-by-Step Retrieval
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Equip the Shovel when the shovel icon highlights the dirt mound between the carts and gear.
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Dig persistently (hold the action button; it takes 20-30 seconds) until a metal hatch is uncovered-no enemies here, but watch for cannibals nearby.
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Climb down the ladder into the bunker hallway.
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Enter the first open room on the right (with a 3D printer and laptop).
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Grab the Maintenance Keycard from the table next to the laptop; print useful items like a flask if needed.
Bonus: Continue down the hall for the Firefighter Axe (top-tier weapon) at the end. Save before digging, and bring light sources for the bunker.
