Quick Answer
- Buried City: search the Raider Camp beneath the Parking Garage.
- Dam Battlegrounds: search for anything significant at the South Swamp Outpost.
- Spaceport: search for anything significant at Bilguun's Hideout, above the wall east of Container Storage.
- Each objective is on a different map, so you need three separate raids and progress persists between them.
- A practical order is Buried City, Dam Battlegrounds, then Spaceport, leaving the hardest access route for last.
What We Left Behind Requirements
Complete Dormant Barons, then make sure you can deploy to all three required maps. You do not need to carry or extract a quest item, so a free loadout keeps the risk low.
For Spaceport, a keycard is optional rather than required because Bilguun's Hideout also has equipment-free access routes.
The Fastest Order to Run All Three Maps
Run Buried City first, Dam Battlegrounds second and Spaceport last. The Buried City objective is a contained search once you reach the lower Parking Garage, the Dam objective is straightforward once you locate South Swamp Outpost, and Spaceport has the most complicated access because Bilguun's Hideout sits on top of a wall.
- Clear Buried City: use the elevator zipline at the Parking Garage and finish both container searches.
- Clear Dam Battlegrounds: move straight to South Swamp Outpost and complete the search interaction.
- Finish on Spaceport: approach Container Storage and use the ladder or rooftop zipline to reach Bilguun's Hideout.
If you already have other quests active on one of these maps, move that map earlier in the order so you can stack objectives in the same deployment.
Buried City: The Raider Camp Beneath the Parking Garage
The Buried City objective is beneath the Parking Garage, on the lower level buried in sand. The Parking Garage is in the middle portion of the map near the Marano Park and Hospital area.
- Reach the Parking Garage and look for the elevator zipline that descends to the buried lower level.
- Ride down into the sand-filled Raider Camp beneath the garage.
- Search both containers in the camp; the objective calls for two container searches before this map is complete.
Once the second container registers, extract if convenient and move to Dam Battlegrounds for the next objective.
Dam Battlegrounds: Find Something Significant at the South Swamp Outpost
Head to the South Swamp Outpost and complete the quest interaction there. The in-game objective is simply to find something significant, so use the outpost itself as your landmark rather than searching the wider swamp.
- Reach South Swamp Outpost on Dam Battlegrounds.
- Search the outpost interior for the quest interaction prompt.
- Complete the interaction and confirm the objective updates before leaving.
No carried quest item needs to survive the raid.
Spaceport: Find Something Significant at Bilguun's Hideout
Bilguun's Hideout is a tall structure on top of the wall east of Container Storage, near Control Tower A6 and Vehicle Maintenance. Container Storage is a valuable, contested POI, so approach the wall instead of lingering in the loot area.
- Start at the far side of the wall and use the ladder if it is accessible; this is the simplest route and needs no keycard.
- Use the rooftop alternative by climbing the Container Storage stairs and taking the zipline across from the roof.
- Use the east office only if you already have the relevant keycard.
- Enter Bilguun's Hideout and complete the search interaction that satisfies the objective.
Once this registers, the three-map quest is complete.
What We Left Behind Rewards
| Reward | Type | Note |
|---|---|---|
| Three weapon attachments | Weapon attachments | The available quest data agrees on three attachments, but the individual attachment names are not reliably itemised. |
What Comes After What We Left Behind
A specific follow-up quest is not reliably established here. After turning the quest in, return to Tian Wen and check the next quest that becomes available in her chain.
Frequently Asked Questions
How many maps does What We Left Behind cover?
Three. You must complete one objective on Buried City, one on Dam Battlegrounds and one on Spaceport, so the quest takes three separate raids.
Where is Bilguun's Hideout in ARC Raiders?
Bilguun's Hideout is on top of the wall east of Container Storage on Spaceport, near Control Tower A6 and Vehicle Maintenance. You can reach it by ladder, rooftop zipline or an east-side office route with a keycard.
Where is the South Swamp Outpost?
It is on Dam Battlegrounds. Once you reach the South Swamp Outpost, search inside for the quest interaction that completes the 'find something significant' objective.
Can you complete What We Left Behind in one raid?
No. The three objectives are on three different maps, but progress persists between raids, so you can finish them one at a time.
Do you need a keycard for Bilguun's Hideout?
No. A keycard can open one route, but the ladder and rooftop zipline routes let you reach the hideout without one.