Borderlands 4 (BL4): Vault Entrance Locations & Interactive Tracking Guide

Vault Entrances are the gateways to the three Primordial Vaults of Borderlands 4 — the most demanding dungeons on Kairos, locked behind a regional Vault Fragment hunt and rewarding permanent Glide Pack upgrades alongside legendary loot on first completion.

Defeating all three Primordial Guardians unlocks the Nothing Left to Guard trophy and achievement. Every entrance location and its required Vault Fragments are cross-linked at exact coordinates on the interactive BL4 game maps.

How to Unlock a Vault Entrance

Each Primordial Vault is sealed until 3 Vault Key Fragments from the same region are collected and inserted at the entrance altar.

Once all three fragments are in inventory, the game reveals the general area of the vault on the map — approach the entrance location to trigger the altar's appearance.

Fragments don't appear automatically on the map, but capturing Order Silos in each region reveals the general area of a nearby fragment via the communications balloon scan.

Every fragment's exact position is cross-linked from each Vault Entrance entry in this guide.

Inside a Primordial Vault

Every Primordial Vault follows a consistent 4-stage structure:

• Arena 1, 2, and 3 — clear waves of elite enemies in three sequential combat arenas. Build optimisation is essential — the difficulty spike is significant compared to the open world, with enemies specifically tuned to test defensive builds and elemental weaknesses.

• Boss arena — the Primordial Guardian spawns after the third arena is cleared. Each Guardian has a unique attack pattern and elemental profile detailed below.

• Yellow orb claim — after defeating the boss, a yellow orb appears in the following room. Interact with it to receive the permanent Glide Pack upgrade. The upgrade is not awarded automatically — the orb must be found and activated.

After the first clear, a Moxxi's Big Encore machine spawns outside each vault for infinite Boss respawns.

Permanent Glide Pack Upgrades Per Vault

Each completed vault awards a distinct, permanent improvement to the Glide Pack traversal system:

• Vault of Inceptus (Fadefields) — increased Glide Pack regen rate
• Vault of Radix (Carcadia Burn) — reduced Glide Pack regen delay
• Vault of Origo (Terminus Range) — 50% cost reduction for Glide Pack use

All three upgrades stack and significantly improve Kairos traversal for the endgame.

All Three Vault Entrances and Their Guardians

• Dissected Plateau → Arch of Inceptus → Vault of Inceptus: Primordial Guardian Inceptus deals non-typed and Corrosive damage. Use the grapple hook to rip armour off its shoulders and hips to expose weak spots. It alternates between tail swipes, a grab attack, and close-range spore clouds. In its final phase, it cocoons itself, and the floor becomes poisonous — use the grapple to hit the cocoon's weak spots, then deal the killing blow with weapons. Required fragments: Coastal Bonescape + The Howl + Idolator's Noose.

• Grindstone of the Worthy → Arch of Radix → Vault of Radix: Primordial Guardian Radix uses Electric attacks. Levitating rocks orbit the boss, acting as a natural melee shield — avoid close range. Watch for lightning strikes. Required fragments: Lopside + Ruined Sumplands + Tonnage Peel.

• The Low Leys → Arch of Origo → Vault of Origo: Primordial Guardian Origo is a flying boss found inside a cave in The Low Leys. The Arch of Origo requires jumping and gliding from the road south of the cave entrance, past an Auger Shrine on the cliff path. Origo alternates between fire and ice elemental attacks — learn the phase transitions before committing to an elemental build. Positional awareness is critical as the arena has fall-death risks. Required fragments: The Low Leys + Cuspid Climb + Windspear.