

Borderlands 4Protean Cell
Electrical resistance is futile.
- ContentBase Game
- Energy
- RarityLegendary
- ManufacturerOrder
- Elements
Protean CellAll Details

On Ground Slam, toggles the Protean Cell’s unique ability: Direct Current
While active, all damage sources deal +40% Bonus Shock Damage, but damage taken bypasses the Shield and drains ≈5% Max-Shield Capacity per second.
- Elements
- Shield PartsLimited PartsLimited Parts
- Firmwarepossiblenone
The Protean Cell always has Nova as its Primary Augment and limited Secondary Augments.
Each Augment also modifies Shield Stats.
All Secondary Augments are equally common giving each a 14.3% Chance (1/7) to appear.
- Capacity +12.5% Rate
+7.5% Delay +25% Max-Capacity - Turtle +7.5% Rate
+5% Delay +40% Shield Capacity
-10% Max-Health - Absorb -5% Capacity
-5% Rate
-7.5% Delay +15% Bullet Absorb Chance, refilling current Gun’s Mag - Adaptive -5.5% Capacity
+5% Rate
-5.5% Delay +8% Max-Health
While active: +20% Resistance to last Damage Type for 3s - Resistance +7.5% Capacity
+5% Delay While active: +17% Elemental Resistance - Spike +20% Capacity
-20% Rate
+10% Delay While active: Taking Melee Damage reflects back 7,041 Damage - Berserker +7.5% Capacity
+5% Rate
+20% Delay While empty: +20% Melee Damage
- Protean Cell: Shield capacity has increased by 33% and the regeneration scaling has increased by 33%.
- Direct Current now only activates while the shield has energy left.
Protean CellHow to get it?
General Farming Guidance
Base Game Items in Borderlands 4 are often obtainable from many sources, including those in DLCs. Here’s your quick start guide:
Farming Preparations
- Identify the Best Source: The Sources below are generally ranked from best to worst. Make sure to complete any required quests and be aware of Source Restrictions.
- Locate the Source: Make sure you have unlocked the Location.
- Equip Your Character: Equip your character to easily overcome enemies.
- Set Spawn Point: Locate the nearest Save Station to use as your spawn point.
Bonus Tips
- Combine Runs: Get more loot per run by integrating nearby sources into your farming route.
- Track Progress: Track your runs to more precisely predict drops and more clearly monitor progress. Additionally, time your runs to see how tweaks affect your farming efficiency.
- Speed it up: Explore shortcuts and boost your movement speed to minimize travel time. Also, aim to shorten your time to kill with higher DPS or big damage bursts.
- Realistic Expectations: Be patient and persistent when farming. Despite precise, verified drop rates, your actual runs might exceed or fall short of inferred expectations.
Protean CellDrop Rates
Bonus Chance: +2% × UVH
Big Encore: 30%





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