One of the many grinds in The First Descendant is acquiring the right materials you need to craft other items, Descendants and Ultimate Weapons. A lot of the materials can be obtained by killing enemies, or hitting up the Munitions caches and Resource Boxes in the open world.
There are some rare materials, though, that can't be acquired this way. For those, you'll need to hit up the Encrypted Vaults, also referred to in game as Encrypted Storage Boxes. These are a little different, and harder to find.
