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To complete What We Left Behind, take on three objectives: search two containers in the Raider Camp beneath Buried City’s Parking Garage, interact with the marked documents at Dam Battlegrounds’ South Swamp Outpost, and read the yellow-marked notes in Bilguun’s Hideout at Spaceport. The objectives can be completed over separate deployments; you do not need to extract with quest items.
How to start What We Left Behind
Tian Wen gives you this quest after Dormant Barons. The ARC Raiders Wiki lists Broken Monument as the quest that follows it. In Tian Wen’s recorded in-game dialogue, she explains that Raider camps have fallen into disrepair and asks you to scout a few.
Buried City: search two containers in Raider Camp
- Go to the Parking Garage in Buried City. GameSpot places it in the northwest of the map.
- Use the southern or southeastern ground-floor door to enter the secured lower area. The garage’s ordinary containers do not count for this objective.
- Take the elevator zipline down to the underground Raider Camp.
- Search any two containers inside the camp. You do not need to carry loot out to complete the objective.
Other raiders may be around the garage, which GameSpot describes as a common car-looting area. Once the objective registers, extracting is a practical way to avoid lingering in the area.
Dam Battlegrounds: interact with documents at South Swamp Outpost
Travel to South Swamp Outpost and look for the yellow-marked quest documents. Interact with those documents to register the objective. Some older guide descriptions suggest searching for anything significant or valuable, including Epic loot; those directions are ambiguous. The detailed location guidance identifies the marked documents as the specific interaction.
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If the objective does not register, check that What We Left Behind is active and that you are at South Swamp Outpost.
Spaceport: read the notes in Bilguun’s Hideout
- Go to Container Storage in Spaceport and look beside the main storage structure for Bilguun’s Hideout.
- Find the hideout on the structure’s east or southeast side, near a broken wall.
- Climb the yellow ladder into the hideout.
- Interact with the notes on the left. The yellow-marked notes—not arbitrary Epic loot—are the required quest interaction.
Finish the quest and collect the reward
After all three objectives register, extract and return to Tian Wen in Speranza to turn in the quest. The ARC Raiders Wiki lists one Muzzle Brake II, one Vertical Grip II, and one Stable Stock II as rewards. Beebom lists Angled Grip II instead of Stable Stock II, so the third attachment is reported inconsistently by the available guides; check the live turn-in if that item matters to you.
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You can complete the map objectives across separate raids, so you do not have to visit all three locations in one run. Choose the order based on which map is available and where you spawn. If you go to the Parking Garage, account for possible player activity there and leave after the two camp containers are searched rather than extending the visit for unrelated loot.
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