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To unlock Gley in The First Descendant, you will need to open a lot of Encrypted Vaults. Unfortunately, these hidden treasure chests are relatively hard to find, spawn randomly on the map, and will disappear if someone else picks them up, which means you will often find nothing in the spawn point. To allow you to collect as Cooling Metallic Foils, here is a complete list with maps of all the Encrypted Vault locations in the game.
All Encrypted Vault Locations in The First Descendant
Remember that the Encrypted Vaults can often not spawn or have already been unlocked by someone else on the map. When reaching one of the locations shown below, make sure to use the scanner. If you don’t hear any sound, it means no vault is close by.
There’s usually a Munitions box right next to their location, and the Munition boxes can be seen using the scanner with a white rectangle.
The icons I used work as arrows. So the exact location is at the bottom of the vault icons.
Sterile Land
Classified Area
Vespers
The Lumber Yard
The Ruins
Lost Supply Depot and Moonlight Lake
Timberfall
Echo Swamp
Misty Woods
Abandoned Zone
Derelict Covert
Muskeg Swamp
Agna Desert
Vermilion Waste
The Mining Site, The Storage, and The Remnant
Miragestone
White-night Gulch
The Mountaintops
Moongrave Basin
Observatory
Shipment Base
Hatchery
Hagios
Dune Base
The Corrupted Zone and Fractured Monolith
Forward Base
Starfall Road
Fortress
Frozen Valley, The Aurora Forest, and Fallen Ark
Convertor Facility and Defense Line
Sterile Land – Classified Area
There’s one under the big staircase right in front of the “Biological Research Facility” mission.