For a series centred around legendary Vault Hunters, there's a surprising lack of vault hunting going on. I'm baffled to say that Borderlands 4 finally changes this, tasking you with finding nine vault key fragments to open three unique vaults hidden across Kairos.
While some are easy enough to track down, others are a right pain and will have you searching every nook and cranny—even once you've unlocked the hint by completing nearby silos. Below, I'll go over where to find each of the vault key fragments and their respective vaults.
