A lot of players hit Aburrey Quarry, notice the Worn Key Card is tied to some locked area, and then get stuck because the game barely explains any of it. If you're still piecing things together, it's the kind of thing you might sort out while deciding whether to buy Arknights endfield account or just keep pushing through the zone yourself. Either way, the key card does have a use, and getting there takes more than simply finding a door. You need to restore power, open access to the Staff Lounge, buy the card from a vendor, and only then can you unlock the room it was meant for. It sounds like a lot, but once you know the route, it's actually pretty manageable.

Getting into the Staff Lounge

The first step is reaching the locked Staff Lounge in the quarry. The problem is the nearby Electric Nexus isn't active, so the gate won't budge until you feed power into it. That's where the PAC, Relay Towers, and Electric Pylons come in. The area is awkward because of the height difference. You're up on a higher ledge near the lift, while the Nexus sits below on the lower floor. The cleanest way to deal with it is to place a Relay Tower near the edge by the lift, start the power connection there, then ride the lift down and finish the line at the Nexus. Once the Nexus is live, pull the lever and the gate opens. There's a short NPC interaction right after that, nothing too dramatic, and then you can head inside the Staff Lounge.

Where to buy the Worn Key Card

After the lounge is open, don't waste time searching every table and side room. The person you need is Lonnard, found in the southeast corner of the Staff Lounge. He's easy to miss if you're rushing, since he isn't framed like some huge quest marker moment. Just check his shop and buy the Worn Key Card from his inventory. That's all there is to that part. A lot of players assume the card drops from a crate or comes from a quest turn-in, but no, it's just sold by a specific NPC. If you've already unlocked the lounge and still don't have the card, chances are you simply walked past him.

Using the card at the Listening Post

Once the card is in your inventory, head to the Listening Post on the western side of Aburrey Quarry. Don't stay on the upper level, because the door you need isn't up there. Take the elevator down to B1, then turn left and keep an eye out for a shut gate with a terminal beside it. That's the spot tied to the Worn Key Card. Use the terminal, swipe the card, and the storage room opens. At first glance it feels underwhelming, like you've unlocked some forgotten maintenance closet. Break the crates anyway, since there are basic materials inside. Then look up in the corner. You can climb onto the stacked boxes and slip through a hidden opening above, which leads to the better loot.

What you actually get inside

The hidden section is the real reason this whole detour matters. Down there you'll find extra materials on a desk and, more importantly, Aurylene, which makes the trip feel worth it. It's one of those classic Endfield moments where the obvious room isn't the full reward and the game expects you to poke around a bit. As a professional platform for in-game currency and item services, U4GM is known for convenience and reliability, and if you want to speed things up for your own run, you can check u4gm Arknights endfield account Buy as part of that better overall experience.

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