One of the trickier optional quests in Stellar Blade right now is called Lost Ark, and yes, the name is a coincidence. This has nothing to do with the Korean MMO. What it does involve is a rebel faction operating out of Xion, a character named Mann asking EVE to track down missing rebels, and a door that will not open until you collect six Greek letters scattered across the city.
The quest is more layered than most side content in the game. Getting inside the Ark is only the first challenge. What happens after you enter adds another layer that catches a lot of players off guard.
Six terminals, six Greek letters
The passcode itself is made up of six Greek letters, each one tied to a terminal hidden somewhere in Xion. You need to physically visit all six terminals before the door will accept any input, so the code alone is not enough without the legwork.
Here is where each terminal sits and what letter it assigns:
None of these terminals are especially hidden, but they are spread across enough of Xion that missing one or two while exploring is easy to do.
The clockwise puzzle and what the hint actually means
Once all six terminals are visited, the door presents a map of Xion with each letter placed at its real-world position. The hint reads: "Turn Xion, turn clockwise!"
The key here is to read the letters in clockwise order starting from the North point of the map, then moving through East, South, and West. Do that and the correct sequence becomes clear.
The full passcode is: θμκαεγ
That is theta, mu, kappa, alpha, epsilon, gamma. Enter that sequence and the door opens.
Getting out is the part most players do not expect
After investigating the Ark's interior, the quest does not simply end. EVE needs to escape, and the exit is locked behind a set of terminals inside the Ark itself. These are not the same interaction type as the passcode terminals outside.
Scanning with the drone will highlight them. What most players miss is that these terminals cannot be interacted with normally. You need to attack them with your sword to destroy them. Work through all of them and the elevator to the exit becomes accessible.
It is a small but genuinely satisfying twist that keeps the quest from feeling like a straightforward fetch-and-unlock loop.
Why this quest stands out in Stellar Blade's side content
Shift Up packed Stellar Blade with optional quests, but Lost Ark earns its place as one of the more memorable ones because it asks players to engage with Xion as a space rather than just a hub to pass through. Tracking down six terminals forces you to look at corners of the city you might have walked past, and the clockwise map puzzle is clever enough to feel rewarding without being frustrating.
For players working through the full side quest list, this one is worth prioritizing. If you want help with other quests and challenges in the game, the Stellar Blade guides collection has everything you need to keep moving forward. Broader gaming guides across other titles are there too if you find yourself jumping between games.
