All Primordial Guardian Loot Drops in Borderlands 4

For the players asking how many Vaults are in Borderlands 4? They will be happy to know that there are 3 Vaults in Borderlands 4, and each of them contains a Primordial Guardian. There is a Vault for every main region of Kairos, and players can unlock them by finding the 3 Vault Key Fragments within each of these areas (except Dominion). Below, we’ll showcase where to find every Vault, along with the dedicated Legendary loot drops associated with every Primordial Guardian that players can fight in Borderlands 4, so you know if these great Vault monsters are worth fighting or not.

Primordial Guardian Inceptus Drops in Borderlands 4

Where to Find Primordial Guardian Inceptus

Legendary	Type	Effect
Extra Medium	Shield	Nucleosynthesis – When Energy Shield breaks or fills, it triggers a Nova that deals significant damage.
Husky Friend	Shotgun	Husky Auto Turret
Ravenfire	Heavy Weapon Ordnance	621 – Explosions radiate outward from the point of impact.
Avatar	Vex Class Mod	Vex and her Minions gain increased Damage Dealt for each active Attunement Skill. Each active Attunement Skill also grants Vex and her Minions Damage Reduction against its matching Elemental Type.
Reactor	Harlowe Class Mod	Whenever Harlowe Entangles an enemy, she gains a Reactor Stack. For every Stack, she gains +2% Movement Speed. When she gains 10 Stacks, she also gains +20% Gun Damage, +20% Fire Rate, +20% Reload Speed, and +20% Status Effect Damage for 12 seconds, and loses all Stacks once the Duration ends.
Elementalist	Amon Class Mod	Whenever an Affinity Skill gains a Stack, all unlocked Affinity Skills also gain a Stack. For each Stack of Affinity from all Affinity Skills, Amon gains increased Movement Speed.
Filantropo	Rafa Class Mod	Whenever Rafa retriggers his Action Skill, he spawns a free Grenade. If he has a Grenade equipped, he spawns one based on that. This Skill has a 4-second cooldown.

The Reactor Class Mod for Harlowe is currently bugged and is not dropping from Primordial Guardian Inceptus as expected. The best method to get the Reactor Class Mod is to complete Vile Bounties from the Contract Boards.

Inceptus is perhaps the easiest of the three Guardians to fight, as he starts with a Shield health bar, which is weak to Shock damage, and then a Flesh bar, which is weak to Incendiary. The only issue with Inceptus is that his Critical Hit spots are shielded on his legs and arms, meaning players need to approach him and yank them open with a grapple. Inceptus behaves like a defensive animal by backing up, swinging with his tail, and pouncing, so stay mobile to avoid his attacks. When Inceptus attaches to the ceiling, shoot at the glowing bulbs of his cocoon to break it open.

The best gear to farm from Inceptus is the class mods, as each of them has distinctive benefits that can improve the power of your chosen Vault Hunter.

Primordial Guardian Origo Drops in Borderlands 4

Where to Find Primordial Guardian Origo

Legendary	Type	Effect
Bottled Lightning	Heavy Weapon Ordnance	Strike Twice
Kaoson	SMG	Granted
Watts 4 Dinner	Shield	Overshield Eater – When Energy Shield is active, enemies have a 12% chance to drop an Overshield when hit. When Overshield is also active, it grants +25% Shock Damage.
Kindred Spirits	Vex Class Mod	Using a Command Skill grants Vex Bonus Kinetic Minion Damage with Guns for a Duration. Command Skills deal Gun Damage in addition to their other types.
Driver	Harlowe Class Mod	Whenever Harlowe fires CHROMA Accelerator, she drains all but 1 of her Health and Amps CHROMA Accelerator. CHROMA Accelerator gains +20% Lifesteal.
Shatterweight	Amon Class Mod	Forgewaves now deal Melee Damage in addition to their other types. Melee Attacks while Scourge is active gain increased Cryo Efficiency and Radius.
Buster	Rafa Class Mod	APOPHIS Lance gains a 25% Chance to not consume Charges. The more Charges used at once, the greater the Chance.

Origo is the flying Primordial Guardian, so players with a focus on melee builds will want to switch out if they wish to farm this boss, for Origo does not like to land for long before swooping in the air. Origo has two Shield health bars, so Shock weapons will be extremely effective for Origo. If players want to hit him even harder, then Origo’s Critical Hit spot is located on his glowing spikey spine. Origo’s main methods involve dive bombing and stomping on the ground for splash damage. He can also switch from Cryo to Incendiary, so be careful not to match his currently attuned elemental type, as it will be weaker.

For Origo, players are going to want to farm Kaoson, as this is a great SMG that can have some incredible build potential with explosives. The Class Mods featured are okay, but they’re completely dependent on the build you’re trying to attune to.

Primordial Guardian Radix Drops in Borderlands 4

Where to Find Primordial Guardian Radix

Legendary	Type	Effect
Adrenaline Pump	Repkit	Blood Rush – Automatically restores Health on Second Wind.
Anarchy	Shotgun	Mutualism – On Auto-Reload or kill, grants +15% Damage and -15% Accuracy for a Maximum 20 Stacks, which reset on manual Reload.
Teen Witch	Vex Class Mod	When Vex has Maximum Health, her Lifesteal partially applies to Shields. When Vex has Maximum Shield, her Lifesteal partially grants Overshield.
Scientist	Harlowe Class Mod	Whenever Harlowe Shocks an enemy, she automatically Entangles and Irradiates that enemy. Whenever Harlowe Entangles an enemy, Electric Arcs shoot out from that enemy at other nearby enemies.
Forge Master	Amon Class Mod	All Forgeskills can now be used once while on Cooldown.
Grenazerker	Rafa Class Mod	Whenever Rafa throws a Grenade or Tediore Gun, he throws an additional one.

Radix is perhaps the hardest of the three Primordial Guardians, and part of that is due to his large health pool. Radix starts with a Shield health bar and then has 2 Armor health bars. This means that players are going to want a Shock weapon, and then a Corrosive or Cryo weapon to finish him off. What makes Radix so deadly is his protective field of Shock-attuned rocks, which will spin around him to absorb damage meant for him and hit players for some lethal damage. Radix also likes to slam on the ground that can be dodged with a jump, and turns the arena into a lightning storm, so be mindful of where you stand and keep moving and shooting.

Radix has perhaps the best Legendary loot of all Primordial Guardians, as the Anarchy Shotgun is great fun for those who care less about aiming and more about Damage. Radix also has the best Class Mods for Vex and Harlowe, which really help with their builds specifically.

Released: September 12, 2025
ESRB: Mature 17+ / Blood and Gore, Intense Violence, Sexual Themes, Strong Language, In-Game Purchases, Users Interact