Encrypted vaults are the standing casket like looking things in the game that you can find by using your ecive (on Playstation it’s the R3 button). They’re often near the green holograms you see in the world. They give an audio cue when your descendant scans the world when facing in their direction. The encrypted vaults in Vespers drop Conductive Metallic Foil which is used in the crafting of Energy Activators and the Python Submachine Gun. In order to open a vault you’ll need to have looted a Code/Precision Code/Ultra-Precision Code Analyzer. These can be found on enemies in the Call of the Descendant missions in each region. Note that not all encrypted vaults will spawn every time. In Vespers, I was seeing maybe 2-3 encrypted vaults in each area at one time. This list will be updated if I find more. If you find a hologram that’s not on my list and want to leave it in a comment, I’ll add it and credit you. 🙂
The Lumber Yard – 4 vaults
The Ruins – 10 vaults
Lost Supply Depot – 5 vaults
Moonlight Lake – 4 vaults
Timberfall – 6 vaults