What You’ll Learn

This guide breaks down the fastest and most practical ways to unlock Expedition Vault slots in ARC Raiders. You’ll learn which high-tier ARC parts matter most, why Bluegate is the best map for several routes, how to approach Queen core runs versus Bastion and Bombardier farming, and how to manage stash space so your progress does not stall at the trader. If your goal is smoother progression and better long-term carryover value, this is the route to follow.

How Expedition Vault Unlocks Work

The Expedition Vault is one of the most valuable progression features because it gives you safe pocket slots that can carry selected items forward into the next expedition. Each vault slot requires a large hand-in of high-tier machine parts, and the key challenge is not only collecting enough value, but also storing everything until you can sell it all at once.

For each vault slot, plan around 200,000 value in qualifying high-tier ARC parts. The most efficient pieces to target are usually:

• Queen cores
• Bastion cells
• Bombardier cells
• Other large ARC drops like matrices, compressors, and pulse units when they fit your route

In practice, most players will progress fastest by focusing on one of two methods:

• A Queen core route for high value per item
• A Bastion and Bombardier route for more consistent repeatable farming

This matters because ARC Raiders progression resources are often limited more by time and inventory pressure than by combat difficulty alone. Choosing the right route can cut the grind down dramatically.

Before You Start: Stash Space and Loadout Planning

The biggest mistake in Expedition Vault farming is ignoring storage. Since the trader hand-in requires a large total at once, you need enough stash room to hold your parts until you are ready to turn them in. Queen cores help here because each item carries high value, while cell farming can quickly flood your stash.

That makes Queen runs especially attractive if your inventory is tight or if you are still building up ARC Raiders Workbench progression and cannot spare many slots.

General Loadout Priorities

• Bring a compact, reliable anti-small-ARC weapon
• Use a strong anti-large-ARC option for leg breaks or burst damage
• Carry a snap hook for movement flexibility and emergency escapes
• Bring adrenaline for tempo and repositioning
• Carry at least one defibrillator if you expect cooperative or mixed lobbies
• Keep healing light so you preserve inventory room for loot

For players trying to optimize their farming loop, this is also where small advantages from ARC Raiders Mods and gear upgrades start to matter. Better handling, cleaner recoil, or faster target breaks can save more time over ten raids than many players expect.

The Two Best Routes for Expedition Vault Farming

Route 1: Bastion and Bombardier Cell Farming

If you want a predictable route that does not depend on a special event target, farming Bastions and Bombardiers is one of the best options. The ideal maps are Bluegate and Buried City because they are compact enough to keep travel time low while still spawning the machines you need.

This route is excellent for players who want steady income from ARC Raiders extraction loot without waiting for the perfect Queen setup.

• Bluegate with electromagnetic storm is especially strong
• Night raids can work well if you are comfortable with the extra danger
• Day raids are still viable if your lobbies are calmer

Electromagnetic storm conditions are especially useful because large ARC presence often feels denser, which increases the chance of finding targets quickly and chaining kills before other players rotate through the area.

Recommended Goal Per Raid

A strong benchmark is to kill two large ARC targets per raid. That keeps your runs efficient and lowers the chance that you spend too long in a match after the best loot window has already passed. Early raid timing matters because the first player to a large ARC usually gets the cleanest loot access.

How to Fight Bombardiers Efficiently

Bombardiers are less durable than many players assume. A heavy weapon like the Hullcracker can remove them quickly without a huge ammo investment. In many cases, a few accurate shots are enough to put one into a vulnerable state and finish it before the fight turns messy.

The safest pattern is simple:

• Use cover and force the Bombardier to look away
• Take clean shots instead of panic firing
• Close only when you are sure the target is nearly finished
• Loot fast and clear the entire inventory to avoid missing cells

Always empty the machine fully, then drop low-priority junk afterward. This prevents confusion over whether you already looted all valuable parts.

How to Fight Bastions Efficiently

Bastions are more dangerous than Bombardiers, so the fight is usually about disabling mobility and exposing the core. Breaking a leg and following up with explosive burst damage is one of the safest approaches. If your explosive placement is not perfect, finish the target with direct heavy shots rather than forcing a risky reposition.

Good Bastion farming comes down to:

• Breaking a leg as early as possible
• Using cover to limit direct return fire
• Placing explosives close to the core when possible
• Looting immediately and moving before other players converge

This route can also generate useful side income in the form of ARC Raiders crafting Materials and motion-core related resources, especially if you are funding launcher ammo or maintaining a repeat farming cycle.

Take a look at: our trinket and blueprint farming route

What Makes This Route Efficient

If a raid gives you around 11 total cells from two large ARC kills, that run can already represent a major chunk of one vault unlock. At that pace, a handful of efficient raids can finish a full hand-in. The exact total varies with drops, but the route works because it is repeatable, compact, and less dependent on a single event boss.

Route 2: Queen Core Farming on Bluegate

If your goal is the fastest value per inventory slot, Queen core farming is the best method. Bluegate is the standout map because the terrain and cover around the checkpoint area make it much easier to manage the Queen safely while focusing on leg breaks instead of a full kill.

This is not a boss-kill route. It is a targeted part farming route.

• The checkpoint area offers excellent cover
• The Queen can be managed in a more controlled space
• Leg parts are easier to approach and loot quickly
• Travel time is often lower than on larger maps

On larger maps, bad spawns can waste too much time. Since Queen core farming is all about tempo, Bluegate usually gives the best returns over a one-hour session.

Recommended Queen Farming Loadout

A weapon like the Equalizer is ideal for breaking Queen legs quickly, while a secondary such as the Renegade helps clear smaller ARC without wasting your main damage setup. The exact weapon names matter less than the role:

• Fast leg-breaking primary
• Reliable anti-small-ARC secondary
• Snap hook for escape and mobility
• Defibrillator for cooperative event zones

Well-tuned ARC Raiders Weapons matter more here than raw boss damage. You are not trying to finish the Queen as fast as possible. You are trying to break parts, loot cores, and leave.

The Core Farming Strategy

Each Queen leg part has a high chance of dropping a Queen core. Because of that, the optimal loop is straightforward:

• Arrive early if possible
• Focus on breaking legs, not killing the Queen
• Rush the dropped part and loot the core immediately
• Clear the entire loot container if possible so it disappears
• Store cores in safe pockets first
• Leave once you hit your target number

A realistic target is three to five Queen cores per raid. Four is a very strong result. If you are solo in a relatively calm lobby, that pace can unlock a vault slot much faster than most players expect.

Why Leaving Early Is Often Correct

Many players stay too long trying to squeeze every possible drop from the full Queen kill. Sometimes that works, but it can also lower your overall hourly value. Once you have secured several cores, extraction is often the smarter play. Shorter cycles mean more runs, more safe turns, and less risk of losing high-value loot.

This is especially true if you are balancing event farming with broader needs like ARC Raiders Materials, ammo production, or future base upgrades. Reliable extraction beats greedy overextension.

Which Route Should You Choose?

Both methods work, but they serve different needs.

Choose Queen Core Farming If:

• You want the highest value per stash slot
• You can play Bluegate during Queen availability
• You are comfortable rotating around event traffic
• You want faster single-slot progress

• You want a route available more consistently
• You prefer controlled fights over event competition
• You like shorter, repeatable raids
• You need extra side drops for ammo or crafting

For many players, the best answer is a hybrid approach: run Queen events whenever Bluegate lines up, then fill the gaps with Bastion and Bombardier farming. That mix usually produces the best overall progression.

Take a look at: this Search Coil guide for Bombardier control

Inventory Management Tips That Save Entire Runs

Farming efficiently is not just about kills. It is also about what you choose not to carry.

• Prioritize vault hand-in parts over generic loot
• Put the highest-value drops into safe pockets first
• Drop low-priority metal, alloy, or filler items once your target loot is secured
• Do not overpack healing if you are specifically farming large ARC
• Use your stash with a plan instead of dumping everything randomly

If your stash is overloaded, it may be better to focus on Queen runs or selectively keep only the most efficient parts. This is one of the hidden bottlenecks behind how to stock up on ARC Raiders Materials without endless grinding: the best farm is the one your storage can actually support.

Lobby Awareness and Risk Management

These routes feel very different depending on lobby behavior. In cooperative or low-conflict sessions, Queen farming becomes dramatically easier because several players can work the event without constant fighting. In more hostile lobbies, the same route becomes riskier because everyone knows where the value is.

Adjust your expectations based on the environment:

• In calmer lobbies, prioritize speed and shared event efficiency
• In hostile lobbies, prioritize cover, fast looting, and early extraction
• Do not force a second target if the raid already gave you strong value
• Always know your nearest extraction before you engage

That same discipline also helps if you are trying to preserve valuable ARC Raiders Blueprints or other rare progression items between raids. Not every successful run needs to be a long run.

How Much Farming Do You Actually Need?

The total depends on your drop quality, but the rough math is encouraging. A few efficient Queen runs can cover a huge portion of one vault unlock. Likewise, steady two-target Bluegate or Buried City runs can build enough cell value surprisingly quickly.

If you stay focused and avoid low-value detours, unlocking all slots is much more manageable than it first appears. The key is choosing a route, sticking to a target per raid, and extracting before greed turns a winning run into a loss.

For players trying to accelerate progression even further, it helps to think of the vault as part of your long-term economy. Better carryover means better future raid stability, easier gearing, and more consistent use of your ARC Raiders Guns and survival tools in later expedition phases.

Best Practices Summary

• Use Bluegate as your priority map whenever possible
• Farm Queen cores for the best value per item
• Farm Bastions and Bombardiers for consistent repeatable progress
• Aim for two large ARC kills per standard raid
• Aim for three to five Queen cores per Queen run
• Loot entire machine inventories to avoid missing key drops
• Leave early once your target value is secured
• Protect stash space for high-tier parts only

If you are stuck deciding where to focus, start with the route your current gear and storage can support most comfortably. Efficient farming is less about perfect execution and more about repeating a practical loop with minimal waste.

FAQ

Queen core farming on Bluegate is usually the fastest method because each core carries high value and takes less stash space than cell farming.

Is Bluegate always the best map for this grind?

For Queen events, yes, it is generally the strongest choice. For Bastion and Bombardier farming, Bluegate and Buried City are both excellent.

Should I kill the Queen or just farm the legs?

For pure efficiency, focus on leg breaks and extract after securing several cores. Full kills can be worthwhile, but they are often slower and riskier.

How important is stash space for Expedition Vault farming?

Very important. Limited storage can slow your hand-ins, especially if you rely on cells instead of Queen cores.

What if I still need other progression resources while doing this?

Use a hybrid route. Run Queen events for vault progress, then use Bastion and Bombardier raids to gather side loot, ammo inputs, and other ARC Raiders rare Blueprints opportunities when available.