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Borderlands 4
Primordial Vault: Carcadia Burn Walkthrough
☆ How Rush Saved Mercenary Day (Bounty Pack 1)
★ 12 active SHiFT Codes as of December 4, 2025
☆ Black Market Location
★ Elemental Weakness Chart
☆ Legendary Weapons
★ Builds: Vex | Amon | Rafa | Harlowe
The Vault of Radix is located in the Grindstone of the Worthy in Borderlands 4. Read on to see how to unlock the Vauld of Radix, how to beat Primordial Guardian Radix, as well as the rewards in this guide.
| Primordial Vaults | ||
|---|---|---|
| Vault of Inceptus | Vault of Origo | Vault of Radix |
List of Contents
How to Unlock Primordial Vault: Carcadia Burn
Collect All Vault Fragments in Carcadia Burn
| # | Where to Get |
|---|---|
| 1 |
Location: Lopside Found on a dining table on the upper level of the house, south of the Makeshift Chalet safehouse. |
| 2 |
Location: Tonnage Peel Found under the Wreck of the Last Great Hope after going down the vent. |
| 3 |
Location: Ruined Sumplands Found in a cove by the water. |
All Vault Key Fragment Locations
Find Vault Entrance at Grindstone of the Worthy
With all three Cardia Burn Vault Fragments, head to the Vault Entrance located at Grindstone of the Worthy. The closest fast travel location is the Rustical Hurl Order Silo, south of the Vault Entrance.
Primordial Vault: Carcadia Burn Walkthrough
Kill All Enemies
| # | Walkthrough |
|---|---|
| 1 |  Enter the vault and interact with the stele to start Primordial Vault: Carcadia Burn. Use the jump pad to start the encounter with the first wave of enemies. |
| 2 | Use the jump pad to proceed to the next area and fight off waves of enemies until they are cleared. |
Defeat Primordial Guardian Radix
| # | Walkthrough |
|---|---|
| 1 |  Once all enemy waves have been cleared, you'll reach a couple of vending machines. Stock up on ammo and health, and sell your junk items in preparation for the boss encounter. |
| 2 | Use the jump pad to enter the boss arena and defeat Primordial Guardian Radix. Aim for its head, its weak spot, while avoiding the boulders. Be mindful of your positioning to avoid lightning strikes! ▶ Primordial Guardian Radix Drops |
| 3 |
 After defeating Radix, pick up your loot and exit the arena by grappling onto the rift. Don't forget to open the red chests at the end! |
Primordial Vault: Fadefields Rewards
| Side Mission Rewards | |
|---|---|
| Rewards |
・EXP ・Cash ・Eridium ・Equipment of varying rarity |
Glide Pack Upgrades
You'll also receive an upgrade for your Glide Pack, depending on the number of Vaults you've finished.
| Vault Clear | Upgrade |
|---|---|
| First Vault | Faster Regen |
| Second Vault | Regen Delay Reduced |
| Third Vault | 50% Cost Reduction |
Note that upgrades are only awarded once per unique Vault!
Borderlands 4 Related Guides
List of Side Missions
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Primordial Vault: Carcadia Burn Walkthrough
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