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Find and defeat Primordial Guardian Radix to receive Legendary rewards and unlock the final tier of difficulty in Borderlands 4.
Radix is one of the three Primordial Guardian bosses in Borderlands 4, each guarding their own Vault in a different region of Kairos. With a wide array of earth and electric attacks at its disposal, Radix is considered the most difficult of the Primordial Guardians to beat.
However, defeating Radix can yield three different Legendary items and a Glide Pack upgrade. Additionally, clearing his Vault is required to unlock the Ultimate Vault Hunter 5 difficulty mode after beating the main story.
Borderlands 4: Primordial Guardian Radix Location
Primordial Guardian Radix resides at the end of the Arch of Radix Vault, located in Grindstone of the Worthy, Carcadia Burn. However, before you can access the Vault, you’ll need to collect three Vault Key Fragments scattered throughout Carcadia Burn.
The Carcadia Range has three Silos that you can capture to mark the search area of the Vault Key Fragments. Silos are Order facilities that you can clear and capture, similar to safehouses, to serve as fast travel points. The three Silos you need to capture are:
- Site Unseen
- Rustical Hurl
- Judgement’s Lapse
After obtaining the keys and entering the Vault, you’ll have to fight through three areas of powerful enemies to reach a checkpoint with two vending machines. Proceed to the arena ahead to challenge Primordial Guardian Radix.
Also Read: Borderlands 4: Primordial Guardian Origo Boss Guide
How To Beat Primordial Guardian Radix Boss in Borderlands 4
- Radix possesses three health bars: one Shield and two Armor. After depleting his Shields with Shock or Radiation damage, you can quickly melt through the Armor health bars with Corrosive or Cryo damage.
- The boss can create a series of orbiting boulders around it, which makes it difficult to get clear shots. Aim for Radix’s legs when the boulders block a clear line of sight.
- Run circles around Radix to dodge most attacks, including thrown boulders. Keep an eye out for electrified ground and Shock attacks.
- Target Radix’s head whenever possible to land critical hits.
- Radix swipes the ground to create a drill on its arm. Using it, it can execute different attacks.
- After losing its Shield, the Primordial Guardian can begin levitating. During this time, it launches powerful AoE Shock attacks.
- Pangolins spawn around the arena throughout the boss fight. Kill them whenever you get breathing room to reduce incoming damage. Since they spawn continuously, you will likely have one available in case you get downed and need a kill for Second Wind.
| Attack | Description | Counter |
|---|---|---|
| Meteor | Radix launches a boulder at you with a pointing gesture. | Run in wide circles around the boss when it levitates boulders. |
| Shock Shards | The boss launches electrified shards at you with a short windup. | Remain on the move and dash when you see a small electric burst near the boss’ mouth. |
| Seismic Shock | The guardian slams the ground repeatedly, creating shock waves of electricity. | Double-jump, glide, and stand atop one of the rocks scattered around the arena. |
| Leaping Slam (Drill) | The boss jumps high into the air and lands with a Shock blast. | Sprint and dash to either side. |
| Burrow (Drill) | Radix burrows underground, emerging elsewhere. | Kill Pangolins and heal if required. |
| Lightning Bolt (Drill) | The guardian pulls its arm back and thrusts it forward to launch a bolt, dealing shock damage. | Sprint or dash to either side. |
| Lightning Storm (Levitating) | Radix causes shock nodes to appear over the arena. Each node launches a bolt of lightning under it. | Refrain from running directly under one of the nodes. Stay still in a safe spot if Pangolins aren’t chasing you. |
Primordial Guardian Radix Legendary Drops and Rewards
After defeating Primordial Guardian Radix, a rift will appear, which you can grapple through to find an altar ahead. Interact with the altar to get a Glide Pack upgrade, which decreases its stamina usage by 50%. Radix has a chance to drop the following Legendary gear.
| Legendary | Type | Effect |
|---|---|---|
| Anarchy | Shotgun | Mutualism – On auto-reload or kill, grants +15% damage and -15% accuracy for a maximum of 20 Stacks, which reset on manual reload. |
| Adrenaline Pump | Repkit | Blood Rush – Automatically restores health on Second Wind. |
| Teen Witch | Siren Class Mod | When Vex has maximum health, her lifesteal partially applies to shields. When Vex has maximum shield, her lifesteal partially grants overshield. |
| Scientist | Gravitar Class Mod | Whenever Harlowe shocks an enemy, she automatically Entangles and Irradiates them. Whenever Harlowe Entangles an enemy, Electric Arcs shoot out from them at other nearby enemies. |
| Grenazerker | Exo-Soldier Class Mod | Whenever Rafa throws a grenade or Tediore Gun, he throws an additional one. |
Forge Master | Forgeknight Class Mod | All Forgeskills can now be used once while on cooldown. |
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