Among the Primordial Vaults in Borderlands 4, Radix’s Vault stands out as a demanding test of survival and strategy. You’ll need to locate key fragments, endure gauntlets of enemies, and finally take on Radix himself—a colossal electric-powered boss with devastating attacks. Preparation and tactical execution are the keys to success.

Radix drops list

Overcoming Radix is no small feat, and the rewards reflect the challenge.

Loot Type Item Name Effect / Special Property
Legendary Weapon Anarchy High power damage weapon—often cited as a reward for defeating Radix.
Legendary Shield Adrenaline Pump Buffs shield related stats (usually more speed or regen-adjacent effects)
Class Mods Forge Master (Amon) Allows all Forge-skills to be used once while on cooldown.
Grenazerker (Rafa) Throwing a grenade or a Tediore-gun action triggers another grenade; more explosive build synergy.
Scientist (Harlowe) Effects: Shock auto-Entangles & Irradiates enemy and arcs Shock to nearby enemies. Good for status / crowd control synergy.
Teen Witch (Vex) When at full HP, lifesteal partially applies to shields; while full, grants an overshield.

These items enhance different builds and provide permanent progression bonuses, making Radix’s Vault a must-complete for players aiming to maximize their power.

Radix Vault location

Radix’s Vault lies deep in Carcadia Burn’s Grindstone of the Worthy. The entrance is a cliffside door positioned near the Rusticarl Hurl silo, directly opposite a Ripper camp. This location is easily identifiable once you’ve gathered the means to unlock it, standing as a foreboding gateway to one of the toughest challenges in the region.

Radix requirements

To gain access, you must first collect three Vault Key Fragments scattered across Carcadia Burn. These fragments are often found in enemy-dense areas, making their retrieval a challenge in itself. Once all fragments are assembled, they combine to form the Carcadia Vault Key. Using this key unlocks the Grindstone door, opening the path to Radix’s gauntlet.

How to defeat Radix’s [step-by-step guide]

The journey through Radix’s Vault is staged, requiring both endurance and strategy before you even face the boss.

Step 1: Gather the fragments

Collect all three Carcadia Burn Vault Key Fragments in hostile zones before approaching the Vault.

Step 2: Enter the Vault and face enemy waves

Inside, you’ll need to clear three arenas, each filled with enemy waves such as Striker Engines, Synth Armatures, and Overwatchmen. Use respawn and ammo points between waves to regroup, resupply, and prepare for the next fight.

Step 3: Reach Radix’s platform

After surviving the final arena wave, take the yellow boost pad to Radix’s boss platform. This marks the start of the true battle.

Step 4: Learn Radix’s phases and weaknesses

Radix’s fight unfolds across health phases:

  • Shield phase (blue bar): Weak to Shock weapons.
  • Armor and health phases (yellow and green bars): Weak to Corrosive weapons.

Aim for weak points—his glowing red fangs and chest vents—for critical damage.

Step #5: Survive his attacks and minions
  • Avoid blue glowing zones, which trigger electrical strikes.
  • Dodge Rock-O-Rampage, where Radix throws spinning boulders. Stay mobile and use a cover.
  • Handle Pangolin minions strategically: keep some alive for potential Second Winds, but stay clear of their explosive corpses.
Step #6: Defeat Radix and claim your loot

Rotate between Shock and Corrosive weapons, punish his weak spots, and maintain mobility. With persistence, you’ll bring him down and earn his exclusive rewards.

Conclusion: claiming victory in Radix’s vault

Radix’s Vault in Borderlands 4 is one of the game’s most layered encounters. From the initial fragment hunt to the multi-wave arenas and the climactic boss fight, it challenges you to adapt and master both combat and survival. With the right preparation, elemental weapons, and smart tactics, you’ll not only overcome Radix but also secure legendary loot that strengthens your journey through Carcadia Burn.