Plenty of players reach Aburrey Quarry, pick up clues, and still have no idea what the Worn Key Card actually opens. That's pretty normal in Endfield. The item looks important, but the game leaves the rest for you to figure out. If you're already checking routes, loot spots, or even browsing Arknights endfield accounts for sale to save time, this little detour is still worth learning because the reward behind the card is easy to miss and surprisingly useful.

Getting the card first

Before anything else, you need access to the Staff Lounge. The problem is the locked gate outside it won't move until the nearby Electric Nexus has power. So, start from a PAC and run electricity over with Relay Towers and Electric Pylons. The awkward bit is the height difference. The lounge area sits above the floor where the Nexus is installed, and that throws a lot of people off at first. The cleanest method is to place a Relay Tower near the lift, send the connection across, then ride the lift down and finish the link from below. Once the Nexus comes online, pull the lever, open the gate, and head inside. There's an NPC around there, and in the southeast corner you'll find Lonnard. Talk to him, check his shop, and buy the Worn Key Card.

Where the card is used

Now head to the Listening Post on the west side of the quarry. Don't stay on the main level too long, because the door you need isn't up there. Take the elevator down to B1. A lot of players walk right past this section since the area blends in with the rest of the industrial layout. Once you step off the lift, turn left and keep an eye out for a shut gate with a terminal beside it. That terminal is the whole reason you picked up the card. Interact with it, use the Worn Key Card, and the storage room opens right away. No extra puzzle. No fight. Just a quiet little room hiding more than you'd expect.

What's actually inside

At first glance, it doesn't look like much. A few crates, some scraps, the usual stuff. Break the boxes and you'll get some basic materials, which is nice, but that's not the real payout. In one corner, the stacked crates let you climb a bit higher. From there, you can spot a hidden opening that's very easy to ignore if you're rushing. Drop through it. That's where the better loot is waiting: materials on a desk and, more importantly, Aurylene. It's a small secret, but it feels good because Endfield loves rewarding people who slow down and poke around instead of leaving the second a door unlocks.

Why this detour is worth doing

The whole Worn Key Card route is a good example of how Endfield likes to mix exploration with light base-building logic. You're not just finding a key and opening a door. You're tracing power, using the map's vertical layout, then noticing that the “reward room” still has one more hidden layer. That's why so many players remember this one. And if you want a smoother start elsewhere, U4GM is known as a professional platform for game items and related services, so it's a convenient option when you're trying to gear up faster, and you can check u4gm Arknights endfield account Buy if that fits the way you want to play.