Borderlands 4 Vault Fragments are collectible keys that open the Primordial Vaults. Clearing all three vaults unlocks the Nothing Left to Guard trophy achievement.
Let’s see where the key fragments are hiding!
Borderlands 4 Vault Fragments Locations
There are nine Vault Key Fragments to collect. To assemble the Vault Key and open the Primordial Vault, you must find all three Key Fragments in the area. Each Primordial Vault presents you with a combat challenge: survive waves of enemies and defeat the Vault Guardian boss.
Vault Key Fragments in The Fadefields
There is a total of 3 key fragments over in The Fadefields, regions include; Coastal Bonescape, The Howl and Idolator’s Noose
Coastal Bonescape

Go to the Stillshore point of interest in the southwestern side of the region and find the item on a crate on the porch of the house near the water.
The Howl

From the base of the mountain in The Howl, make your way inside the cave and collect the Key Fragment from the pedestal inside.
Idolator’s Noose

Discover the Rosemary’s Reserve point of interest in the region. Pull the grate on the side of the building and find the Vault Fragment in the hidden area.
The Fadefields Primordial Vault: Arch of Inceptus

After collecting all three Key Fragments, head to the Dissected Plateau and enter the vault.
Borderlands 4 Vault Fragments in Carcadia Burn
There is a total of 3 vault fragments scattered within the Carcadia Burn area. Including regions such as; Lopside, Tonnage Peel and the Ruined Sumplands
Lopside

The Vault Key Fragment is on a table above the gas station. Over in Lopside
Tonnage Peel

Enter the tunnel, pull the grate on the left, and drop down to find the item. This one is found over in Tonnage Peel
Ruined Sumplands

Make your way to Hull’s Handbasket point of interest, over in the Ruined Sumplands, and look for the Vault Fragment under the rock structure.
Carcadia Burn Primordial Vault: Arch of Radix

The Primordial Vault in this area is in the Grindstone of the Worthy.
Vault Key Fragments in Terminus Range
A further 3 key fragments are located within the Terminus Range, in locations such as; Cuspid Climb, The Low Keys and The Windspear
Cuspid Climb

From the base of the mountain in The Goredello point of interest, start making your way up. Glide over to the right twice and enter the cave. Go up and find the item next to a corpse on the ground.
The Low Leys

Follow the rocky path up in The Pit point of interest to reach the fragment.
Windspear

The fragment is inside the enemy base in The Vestal Garrison point of interest.
Terminus Range Primordial Vault: Arch of Origo

The Primordial Vault in Terminus Range is in The Low Leys.
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