“What We Left Behind” is a late-game scavenging quest that completes only when you loot specific hotspots across three maps. Progress advances when the item you pick up counts as “significant.” If your pickup doesn’t register, extract and re-enter the zone for another try.

ARC Raiders What We Left Behind objectives (overview)

  • Dam Battlegrounds: Search for anything significant in South Swamp Outpost.
  • Buried City: Search two containers in the Raider Camp beneath the Parking Garage.
  • Spaceport: Search for anything significant in Bilguun’s Hideout next to Container Storage.

“Significant” items are high-value pickups (often Epic-grade or valuable recyclables). Multiple runs may be needed; extraction safely banks progress and lets you reroll spawns.

Dam Battlegrounds — South Swamp Outpost (significant loot)

Step 1: Deploy to Dam Battlegrounds and head to South Swamp Outpost. Move cautiously; this area often draws ARC patrols.

Step 2: Look for a narrow tower tucked among trees at the outpost. Enter and search the interior rooms for higher‑rarity loot or valuable materials.

Step 3: If your pickup doesn’t move the quest bar, extract at the nearest exit. Queue back into Dam Battlegrounds and re-check the outpost for a fresh roll of items.

Bring healing items to stabilize between fights—the outpost can be busy, and the tight interior leaves little room to reposition.

Buried City — Raider Camp beneath the Parking Garage (search 2 containers)

Step 1: Drop into Buried City and navigate to the Parking Garage on the north side of the map. Look for a spiral entry ramp with disabled cars.

Step 2: Ascend the spiral and locate a lift door in one of the parking bays. Position yourself for a quick breach; enemies often patrol this floor.

Step 3: Breach the lift door to reveal a rope down into the underground section. Descend to reach the Raider Camp area below.

Step 4: Search any two loot containers within the camp to tick the objective. If a container search fails to register, clear the area, extract, and retry a new instance of the garage.

The garage is a frequent combat hotspot. Carry extra heals and keep cover between you and ranged threats while opening containers.

Spaceport — Bilguun’s Hideout by Container Storage (significant loot)

Step 1: Enter Spaceport and make for Container Storage. Approach its eastern side to line up with the hideout route.

Step 2: Just west of the Communications Tower, find a long ladder leading up to a small room—that’s Bilguun’s Hideout. Climb carefully; you’re exposed while on the ladder.

Step 3: Loot inside the hideout until the quest bar advances. If nothing counts as “significant,” extract and re-run Spaceport to reroll the item pool.

This spot is compact and easy to sweep; the bottleneck is whether an eligible item spawns. Don’t linger after you get credit—bank it via extraction.

Turn-in and rewards

Completing all three objectives awards Tier II weapon attachment components. Expect Muzzle Brake II and Vertical Grip II, plus one additional Tier II attachment.

What counts as “significant” loot for this quest

The quest tracks items with notably higher value, typically Epic-grade or materials with strong recycle value. If you’re unsure an item will register, pick it up anyway—progress updates immediately. No update means it didn’t qualify; extract and try again rather than spending time searching the same instance.

Finish each location cleanly, bank your progress, and keep re-rolling until a qualifying item appears. Two efficient loops per map is usually all it takes.