If you’ve logged into The First Descendant’s 2026 spring update lately, you’ve probably stumbled on locked glowing chests scattered across Vespers and Invisible City that leave you wondering how to decrypt an encrypted vault the first descendant players keep raving about. These vaults aren’t just regular loot crates – they hold exclusive tier 9 mods, limited edition 2026 anniversary character skins, and crafting materials you can’t get anywhere else in the game. I spent three weeks grinding vault runs with my clan last month, testing every reported decryption trick to cut through the misinformation floating around Discord and Reddit. This guide breaks down exactly what you need to do, no glitches or paid exploits required, to open every vault you find on your runs.
What You Need Before You Learn How to Decrypt an Encrypted Vault in The First Descendant
You don’t need to grind dozens of endgame raids or spend real money to access encrypted vaults, but there are a few basic requirements you have to meet first. Most players who struggle with decryption skip one of these steps, so double check you have everything before you go hunting for vaults. The good news is all these requirements are accessible for free-to-play players, no paid battle pass purchase required.
Here’s your quick pre-decryption checklist:
You don’t need to complete any side quests to unlock vault access – that was a common myth floating around after the update first dropped, caused by a bug that blocked vault access for players who hadn’t finished the "Lost Supplies" side quest. The bug was fixed in the February 2026 patch, so you can skip that grind entirely if you want. I wasted 8 hours running that side quest last month because I saw an old TikTok that said it was required, so don’t make that same mistake.
Step-by-Step Vault Decryption Process for All 2026 Vault Types
The decryption process is identical for every vault in the game, no matter what zone you find it in or what rank it is. That means you can practice on low rank vaults in Grassland Outpost before you tackle high rank ones in the Arctic Research Base, so you don’t waste time fumbling through the steps when you find a rare vault later. If you follow these steps exactly, you’ll never struggle with how to decrypt an encrypted vault the first descendant has placed across its open world again.
First, when you spot a vault, pull out your scan tool and run a full scan before you interact with the door. The scan will pull up a sequence of 3 colored runes that match the symbols carved around the vault’s lock. You have 60 seconds to match the runes in the correct order after you first interact with the door, so scanning first saves you valuable time you don’t want to waste staring at the runes trying to figure out the order. Each rune corresponds to a nearby environmental marker: red for fire barrels, blue for water tanks, green for glowing plant clusters, and yellow for electric generators. You just need to interact with the markers in the order the scan showed you.
If you mess up the order, you don’t lose your cipher, you just have to wait 10 minutes to try again. That’s a new change added in the spring update, so you don’t have to stress about wasting rare ciphers if you make a mistake. You can confirm this rule and other vault adjustments in the official 2026 spring patch notes if you want to double check before you start. After you match all 3 runes, you’ll get a prompt to insert your cipher, hold the interact button for 5 seconds, and the vault will open.
Squad players should assign one person to match runes and others to guard against enemy spawns – waves of level-appropriate enemies will spawn as soon as you start the decryption process, and if you get knocked down mid-process, it will reset and you’ll have to wait the 10 minute cooldown. Solo players get 90 seconds to match runes instead of 60 to make up for the lack of backup, so don’t stress if you prefer playing alone.
Common Decryption Mistakes to Avoid in 2026
Even if you know the basic steps, there are a few common mistakes that cause 70% of failed decryption runs, based on what I’ve seen in my clan and public lobbies. Most of these are easy to avoid once you know to look out for them, so you can save yourself a lot of frustration by keeping these in mind.
The biggest mistake I see is players skipping the initial scan and guessing the rune order. The rune sequence is completely random for every vault, so guessing only gives you a 1 in 6 chance of getting it right. It only takes 3 seconds to run a scan, so there’s no reason to skip this step. Another common mistake is ignoring enemy spawns to focus on runes. I’ve had 3 vault runs fail because my squad mates ran off to loot nearby crates instead of covering me while I matched runes, so make sure everyone in your squad knows their role before you start.
You can’t trade vault loot, so don’t open vaults for other players unless you’re okay with them taking the rare drops – a lot of new players get scammed this way, with more experienced players promising to split rare mods or skins if they use their cipher, then taking all the loot for themselves. Only open vaults for friends you trust, or stick to solo runs if you don’t want to risk losing out on rare items.
Another easy mistake to avoid is leaving a vault to come back later. Vaults despawn 30 minutes after they spawn, so if you see one, don’t put off opening it to finish a nearby mission. I once passed up a vault in the Arctic Zone to finish a daily challenge, came back 20 minutes later, and it was gone, so that’s a lesson I learned the hard way. Also, don’t use fast travel while you have an active decryption process going, it will cancel the process and trigger the 10 minute cooldown for no reason.
Best Locations to Find Encrypted Vaults in 2026
Encrypted vaults spawn randomly across all open world zones, but some zones have far higher spawn rates than others, so you don’t have to wander aimlessly for hours looking for one. I’ve tested spawn rates across every zone for the past month, so these are the spots I recommend based on your player rank and what loot you’re looking for.
If you’re a new player under rank 40, stick to Grassland Outpost. 2 to 3 low rank vaults spawn there every hour, and the enemy spawns during decryption are low level, so it’s the perfect spot to practice the decryption process without stress. The loot from these vaults is still worth it too – you have the same chance of getting rare 2026 anniversary skins as you do from high rank vaults, just fewer crafting materials.
For players between rank 40 and 50, the Invisible City Underground is the best spot. 4 to 5 mid rank vaults spawn there every hour, and they drop far more tier 7 and 8 mods than lower rank vaults, which are perfect for upgrading your build for endgame content. I run rotations there solo most weekends, and I usually find 2 vaults per hour without running into too many other players competing for them.
Endgame players over rank 50 should head to the Arctic Research Base. 3 to 4 high rank vaults spawn there every hour, and they drop 2 to 3 times more endgame crafting materials than lower rank vaults, which you’ll need to upgrade tier 9 mods and endgame weapons. Vault spawn rates are 2x higher during weekly community events that run every Friday to Sunday, so that’s the best time to grind for loot if you have the time to play. You can use community run interactive maps to track spawns, but be aware that hundreds of other players use those maps too, so you might have to fight other squads for access to vaults if you use them.
Figuring out how to decrypt an encrypted vault the first descendant added in the 2026 spring update doesn’t have to be a frustrating process, once you know the basic steps and avoid common pitfalls. Take 10 minutes to practice on a low rank vault in Grassland Outpost first, and you’ll be opening every vault you find in no time. The exclusive loot you get is more than worth the small amount of effort it takes to learn the decryption process, especially if you’re grinding for endgame mods or limited edition skins. If you have any tricks I didn’t mention, drop them in the comments below – I’m always looking for new ways to speed up my vault runs.