Still, if you're running raids regularly in The Blue Gate, the key is a worthwhile investment of inventory space. The guaranteed material pickups alone make each cellar visit profitable, and you never know when you'll grab a grenade or extra attachments that can turn a rough fight in ARC Raiders Coins your favor.

Final Tips

Use the key during Night Raids for the best loot quality.

Approach cellars near Raider's Refuge with caution-expect raider encounters.

Always clear the surrounding area before entering cellars to avoid ambushes.

Keep the key in a safe pocket so you don't lose it during combat deaths.

The Blue Gate Cellar Key is simple but surprisingly useful, especially when you know the most reliable cellar locations. With multiple hatches available across The Blue Gate and steady crafting supplies inside, the key offers consistent value for any player navigating this early-game region.

How to Complete the Cold Case Quest in Arc Raiders
The world of Arc Raiders is full of volatile encounters, shifting extraction routes, and hidden loot-so when a quest offers a chance to wrap things up quickly, it's worth taking advantage of it. One of the earliest missions you'll encounter in Stella Montis, the game's first post-launch map, is a mission called Cold Case. At first glance, it looks like a lengthy scavenger hunt: you're told to search the urban ruins of Stella Montis for a J Kozma storage container, retrieve a certain quest item, and then safely extract back to Speranza.

Fortunately, the quest is much simpler than it appears. There are multiple Kozma containers scattered throughout Stella Montis, but one of them is located in an unusually convenient spot-mere steps from an extraction terminal. With the right approach, you can complete the entire mission in just a few minutes.

This guide walks you through where to go, what to look out for, and how to extract safely so you can clear Cold Case efficiently and get back to raiding.

Before You Begin - What You Need to Bring

Cold Case has one requirement that players often overlook:
You must extract the ARC Raiders Items you find inside the Kozma container.

That means you'll want to bring a loadout that includes:

A safe pocket - If another raider ambushes you before extraction, losing the quest item will force you to start over. Storing it in a secure pocket gives you insurance.

A mid-range or defensive weapon setup - The extraction point is relatively close, but encounters with players or ARC units can still happen.

A mobility tool - Anything that helps you reposition quickly or retreat to cover can make extraction dramatically safer.

While the route for this quest is extremely short, the game is unpredictable. Treat Cold Case like any other run: go in prepared.

Where to Find the J Kozma Storage Container

All J Kozma storage containers spawn exclusively on the Stella Montis map, and you may come across several during a regular raid. However, the most reliable-and by far the easiest-location is inside the Lobby Metro Station, one of the map's primary underground points of interest.

This location is perfect for Cold Case because:

It contains a guaranteed Kozma container.

The container sits right beside the metro extraction button.

The entire interaction-from pressing the button to opening the container-takes place in the same small room.

If your goal is maximum efficiency, this is the only location you need.

How to Reach the Lobby Metro Station

Once you deploy into Stella Montis, make your way toward the Lobby Metro Station marked on the map. The entrance is hard to miss: look for a partially collapsed structure leading into the underground metro tunnel system.

When you enter:

Descend the staircase or the broken escalators into the station.

Follow the lanterns, signage, or platform lights until you reach the metro platform area.

Move toward the extraction call console-the same terminal you would use when leaving the map.

The Kozma container is extremely close, so getting lost is unlikely.

Looting the Container and Obtaining the Old World Books

Once you locate the extraction button inside the station, you're already at the finish line.

Here's what to do:

Press the extraction button to call the train in advance.

This ensures you're not stuck waiting once you've collected the quest item.

After pressing the button, turn around 180 degrees.

Just a few steps behind you, you'll see the J Kozma storage container sitting directly across from the terminal.

Interact with the container.

It will pop open and drop an item called Old World Books, which is the object Shani needs to complete the quest.

Place the books into a safe pocket if possible.

This protects the ARCR Items from loss if another player eliminates you during the extraction phase.

With that, the hardest part of Cold Case is already finished.

Extracting Back to Speranza

The only thing left to do is get out safely.

After calling the metro train, take cover behind one of the nearby pillars, walls, or vending stations.

Even though this location is usually quiet, it's still an extraction zone-making it a prime spot for ambushes.

Listen for the train to arrive. When the doors open, move quickly but carefully.

Step inside and immediately use the onboard extraction console.

Once activated, the train will whisk you back to cheap ARC Raiders Coins Speranza, completing the quest and securing your loot.