[ARC Raiders]Quest “What's Left Behind” Complete Guide | Detailed locations, rewards, and efficient routes for all 3 tasks[Ark Raiders]
ARC Raiders is a cooperative PvPvE shooter game developed by Embark Studios. Players play as “Raiders'' on a devastated Earth, collecting resources and fighting against powerful enemies “ARC'' to survive. The quest system is an important element of the game, and by completing tasks given to you by traders, you can earn rewards such as custom parts for weapons and consumables. “What's Left Behind” is a quest from Tian Wen, and it's an exploratory mission that takes you across three different maps. This is a popular quest that can be attempted by everyone from beginners to experts, but the drawbacks are that the location is difficult to understand and it is easy to fail due to the large number of enemies.
This guide reveals all the quests and provides step-by-step instructions on the exact location of each task. We also propose an efficient combination route with blueprint collection and financial planning. The reward custom parts are essential for strengthening intermediate weapons, so we recommend clearing the stage as soon as possible. We will deliver a lot of tips that can be used both solo and in a team.
- Overview of the quest “Things Left Behind”
- Preparation before the attack: Recommended equipment and skills
- Task 1: Buried City | Investigate 2 Raider encampment containers in the basement of the parking garage
- Task 2: Dam Battlefield | Investigation of important items at the southern swamp base
- Task 3: Spaceport | Investigate important items hidden in Bilgoon next to container storage
- All task efficiency loop routes and financial tips
- Points to note and common failure patterns
- Summary: Accelerate your mid-game reinforcement with this quest
Overview of the quest “Things Left Behind”
basic information
| item | detail |
| client | Tian Wen (located in the trader area) |
| Prerequisite quest | Clear “Dormant Baron” |
| Difficulty level | Intermediate (lots of exploration, high enemy encounter rate) |
| Time required | Solo: 30-60 minutes / Team: 20-40 minutes |
| Clear conditions | After completing all three tasks, report to Tian Wen. |
Reward list
The rewards for this quest focus on parts that greatly improve the stability and accuracy of your weapon. In particular, “uncommon” rarity parts are ideal for increasing firepower in the early to mid-game.
| reward item | quantity | Effect summary |
| Muzzle brake II | 1 | Recoil reduction, accuracy improvement |
| Vertical grip II | 1 | Vertical recoil suppression, stable shooting possible |
| Stable Stock II | 1 | Reduces lateral recoil and improves ADS speed |
| others | – | A set of uncommon custom parts (with random elements) |
Equip these parts to popular weapons such as “Rattler III” and “Stitcher” to gain an advantage in ARC boss battles and Raider PvP.
How to receive a quest
- Talk to Tian Wen in the trader area.
- If you have cleared the prerequisite quest “The Dormant Baron”, you will be able to accept the order automatically.
- Three objectives are displayed in the quest log, but only some have yellow markers. Container investigations etc. need to be searched manually.
Preparation before the attack: Recommended equipment and skills
Quests focus on exploration, so give priority to mobility and survivability.
Recommended weapons and equipment
- Main weapon: Rattler III (medium ammunition, high stability) + spare reward parts above
- Sub-weapon: Stitcher II (for close-range sweeping)
- Consumables: 3x resuscitation equipment, 3x adrenaline injections, 3x sterilized bandages
- Armor: Medium shield, ranged raider flare (for escape)
Required skills
| Skill name | reason |
| marathon runner | Reduces stamina consumption when traveling long distances |
| young lungs | Oxygen can be maintained underwater or in swamps. |
| Security breakthrough | Speeds up door breaking |
“Naked Sortie” is also effective with the free loadout. Quest items are automatically stored in safe pockets, allowing you to travel quickly and with light clothing.
Task 1: Buried City | Investigate 2 Raider encampment containers in the basement of the parking garage
Buried City is a dense urban ruins map with the highest number of raider enemies. Parking garages are located in battle zones (around space travel, research areas, hospitals).
Details location and steps
- Aim for the parking garage near the center of the map. It is possible to enter from the rooftop or the elevator on the first floor.
- Destroy the next breakthrough door with “01” written on the wall (shotgun recommended).
- Descend underground on a zip line. You will arrive at the Raider encampment area.
- Take turns examining the two containers in the back (boxes and scavengeable objects). There is no yellow mark, so don't forget to check the log.
map image description: The garage is located southeast of the hospital, marked by a red container. The basement is dark and narrow, so a flashlight is essential.
Enemies and Tips
- Enemy composition: 5-10 raiders, small ARCs will appear occasionally.
- Tips: There will be more enemies during the night attack event. If you are a team, place one person on guard. If you combine it with the blueprint route (via the Santa Maria houses), you can clear it in one lap. Solo escapes with a smoke bomb.
Efficiency route example:
Spawn → Rosa Plaza Pharmacy Money Strategy → Underground Garage → Escape (You can expect more than 30,000 coins)
Task 2: Dam Battlefield | Investigation of important items at the southern swamp base
Dam Battlefield is a map with a lot of water, and movement is often restricted. The base of the southern swamp is located on the southwest or east side, at the south character position.
Details location and steps
- Head to the swamp area to the southwest of the map. Aim for the double dome building in the center.
- Inside the north dome, investigate the file on the table (an important item that glows yellow) near the red tool stand and scrap wood.
- A clear log will appear immediately upon interaction.
map image description: Located next to the remains of Baron and the water treatment center. It's easy to get lost in the swamp.
Enemies and Tips
- Enemy composition: Raider groups and wasps (airborne enemies) will appear.
- Tips: Cross the swamp with young lung skills. Collected at the same time as the weapon case (high probability of blueprints). Attract enemies by dispersing your team.
Efficiency route example:
Spawn → Minamisuma base → Hydroponic dome → Escape (2-3 blueprints can be obtained)
Task 3: Spaceport | Investigate important items hidden in Bilgoon next to container storage
The spaceport is vast and has a high ARC appearance rate. The target is the upper part of the east outer wall of the container storage room.
Details location and steps
- Head to the eastern barrier of the container storage area. A treehouse style hut is located on the outside wall.
- Climb the ground ladder.
- Interact with the “Collect Notes” object at the back of the interior.
map image description: Located just east of the storage room, it stands out in a high position. Near the rocket assembly site.
Enemies and Tips
- Enemy composition: Powerful ARC (Hornet) and Raider will appear.
- Tips: Use the zip line skill to approach at high speed. Be careful with PvP. It also serves as the key room blueprint.
Efficiency route example:
Spawn → Storage → Delivery warehouse key room → Escape (you can aim for rare blueprints)
All task efficiency loop routes and financial tips
Since you will be crossing 3 maps, we recommend one map per day. To reduce total time:
- Buried town (morning) → Immediate escape report.
- Dam Battlefield (daytime) → Emphasis on money policy.
- Spaceport (night) → Also serves as ARC hunting.
Expected value of total monetary policy: 100,000 coins + 5 or more blueprints. Collect field storage/crate on detour.
| map | Detour spot | expected drop |
| buried city | santa maria houses | Epic accessories, weapon crates |
| dam battlefield | Minaminuma weapon case | Blueprint high probability |
| spaceport | delivery warehouse | snap hook blueprint |
Points to note and common failure patterns
- Quest item management: Safety pocket is automatic, but be careful that it disappears when the inventory is full.
- Enemy Ambush: The basement/hideout is a closed space. Alert with sound.
- Time limit: Avoid during events (electromagnetic storms).
- Solo vs team: Solo players go out naked, teams have different roles (1 exploration, 2 lookout).
FAQ
Q: Doesn't the yellow mark appear?
A: Two containers are manually inspected. Please check the log.
Q: Haven't cleared the prerequisite quest?
A: Prioritize “Dormant Baron”.
Q: Where can I equip the reward parts?
A: A medium assault rifle is best.
Summary: Accelerate your mid-game reinforcement with this quest
“What's Left Behind” is a quest where you can hone your exploration skills and earn plenty of rewards. If you practice the above route, you can clear it with zero failures. Increase trader reliability by linking with Tian Wen's other quests (e.g. Broken Monument). Enjoy survival, which is the best part of ARC Raiders, and take on strong enemies. Next up is a guide to Victory Ridge.
