Plenty of players reach Aburrey Quarry, pick up the Worn Key Card trail, and then stall out because the game never really spells the process out. That's the annoying part of Endfield. It trusts you to figure things out, even when the clue is basically “go poke around some industrial ruins and hope for the best.” If you're stuck, the good news is that the whole route is contained inside the quarry, and once you know where to go, it's pretty manageable. If you've already been comparing routes, loot, or even checking out Arknights endfield accounts to see how far other players have pushed the area, this side objective is still worth doing on your own because the reward room has more tucked away than it first appears.



Getting Into the Staff Lounge
Your first stop is the Staff Lounge, since that's where the key card actually comes from. The catch is that the door won't open until you reactivate the Electric Nexus nearby. So, first, pull out your PAC and start linking power with Relay Towers and Electric Pylons. The layout can be a bit awkward because the lounge sits higher than the main power source. That vertical gap is what trips most people up. A simple way to handle it is to place one relay near the lift, then ride down and continue the chain from the lower level back to the source. Once the line is complete, the Nexus powers up. After that, pull the lever, speak to the NPC standing close by, and the lounge becomes accessible.



Where to Buy the Worn Key Card
Inside the Staff Lounge, don't waste time searching every corner first. Head toward the rear section and look in the southeast side of the room for Lonnard. He's the NPC you need, and yes, the card is sold through his shop rather than found on a table or hidden in a locker. That detail throws people off all the time. Open his trade menu and you'll see the Worn Key Card available for purchase. It doesn't cost much, so there's no reason to hold off. Buy it right away and keep moving, because the card only matters once you reach the next location.



Using the Card at the Listening Post
Next, head over to the Listening Post on the quarry's western side. Find the elevator there and take it down to B1. This part is easy to miss if you're sprinting through the area, since the gate you need isn't placed in a dramatic, obvious spot. Look for a terminal beside a sealed storage room door on the lower floor. Interact with it, and the Worn Key Card will unlock the gate. At first, the room may feel underwhelming. A few players walk in, grab the visible loot, and leave. Don't do that. Break the boxes off to the side for extra materials, then climb the stacked crates and drop through the hidden opening below. There's another stash on the desk down there, and that's where the room starts feeling worth the effort.



What Makes the Detour Worth It
The best part of this whole little hunt is the Aurylene waiting deeper in the storage area, which turns the card from a random inventory item into a genuinely useful find. It's not just about one pickup, either. You're getting materials, hidden loot, and a nice payoff for actually reading the space instead of charging through it. That's kind of how Endfield works at its best. As a professional platform for game currency and item support, U4GM is a convenient option for players who want a smoother time with progression, and you can check u4gm Arknights endfield account Buy if you'd like a faster start while still enjoying the quarry's more rewarding side routes.

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