Summary
- Collect 3 Vault Key Fragments in each region (Fadefields, Carcadia Burn, Terminus Range) to unlock the Primordial Vault entrance in that area.
- Inside each Vault, clear 3 arenas then defeat the Vault Guardian boss to gain permanent upgrades and loot, and to unlock the Nothing Left to Guard achievement.
Primordial Vault is one of the major endgame features in Borderlands 4. If you find all of them, it gives you top-tier loot, but also contributes to achievements like Nothing Left to Guard. This guide will show you where each Vault is, how to unlock them, fragment locations, what to expect inside, and tips to prepare.
What Are Borderlands 4 Primordial Vaults
There are three Primordial Vault in Borderlands 4. Each one lives in a different region of Kairos (excluding Dominion): The Fadefields, Carcadia Burn, and Terminus Range.
To open a Primordial Vault in a region, you must collect three Vault Key Fragments (sometimes called Vault Fragments) hidden in that region. Once you have all three, the Vault Key appears and you can use it to unlock the Vault entrance.
Inside a Primordial Vault, you’ll face waves of enemies in three arenas, then fight the Vault Guardian boss in the fourth. Rewards include rare loot and permanent upgrades (such as Glide Pack improvements), which help for traversal and builds.
Locations of All Primordial Vaults & Fragments
Here are the three Vaults, plus where to find their fragments. You’ll need all three fragments in each region to unlock the portal.
Primordial Vault #1: Arch of Inceptus (The Fadefields)
|
Fragment # |
Location |
|
Fadefields Fragment 1 |
Coastal Bonescape – on a crate in a house by the beach; near Stillshore. |
|
Fragment 2 |
The Howl – up a rocky area north of Launchpad; climb ledges to plateau. |
|
Fragment 3 |
Idolator’s Noose – under a building via a grate you pull using grapple; near Rosemary’s Reserve. |
The Arch of Inceptus sits in the Dissected Plateau in The Fadefields. Once fragments are in place, a stone pillar appears. All you have to do is insert the key, and the purple portal opens.
Primordial Vault #2: Arch of Radix (Carcadia Burn)
|
Fragment # |
Location |
|
Carcadia Burn Fragment 1 |
Lopside – rooftops of a gas station; use grappling points. |
|
Fragment 2 |
Tonnage Peel – in a tunnel; use vent/grate to access hidden area. |
|
Fragment 3 |
Ruined Sumplands – on the edge of rocky formations near water. |
Arch of Radix is located near Grindstone of the Worthy in Carcadia Burn. After gathering all fragments, insert the key and use the portal to enter.
Primordial Vault #3: Arch of Origo (Terminus Range)
|
Fragment # |
Location |
|
Terminus Range Fragment 1 |
Cuspid Climb – atop a mountain plateau, requires gliding from a cliff to reach. |
|
Fragment 2 |
The Low Leys – near road, use grapple points on rocky outcrops; climb to ledge. |
|
Fragment 3 |
Windspear – inside enemy base; second-floor area, accessible via building entrance. |
In The Low Leys region, Terminus Range. After placing the key, a stone lever or pedestal appears, then the portal gets activated. You can then enter for the full Vault challenge.
Rewards & Perks of Borderlands 4 Primordial Vaults
Just like any other quests or vaults, the Primordial Vaults give you something special.
-
- Permanent Glide Pack upgrades: Each Vault gives you a boost (e.g. faster regen, reduced cost) to improve how you travel across the map.
- High-tier loot & boss drops: Vault Guardian bosses drop legendary weapons, class mods, special loot tags unique to these Vaults.
- Progress toward achievements: Defeating the bosses in all three Vaults unlocks the “Nothing Left to Guard” trophy/achievement.
Final Thoughts
It can be rewarding once you hunt down every Borderlands 4 Primordial Vault. There are three Vault Key Fragments in each zone, the Fadefields, Carvadia Burn, and Terminus range. With them, you gain access to powerful arenas with enemies, loots, and bosses that drop exclusive gears. Defeat them and all the loot is yours.
Writer’s Recommendations
Hi there, it’s Stal! If you loved that article, make sure to check out these other articles I’ve written just for you. See you there!
