Updated: Oct 06, 2026

Borderlands 4Bio-Robot

This place is not a place of honor.

Content
Base Game
Class
Harlowe
Rarity
Legendary
Manufacturer
Skill Bonuses
Confirmative Reality
Feedback Loop
Sustained Reaction
Practical Applications

Bio-RobotAll Details

Copy Bio-Robot Code

Bio-Robot - About

The Legendary Harlowe Class Mod Bio-Robot comes from the Borderlands 4 Base Game.

Bio-Robot - Unique Ability

Whenever Harlowe Entangles an enemy, she creates alternating Cyro Hazards and Radiation Hazards.

Harlowe's Bio-Robot Class mod always comes with the unique Stat:

+70% Hazard Damage

Bio-Robot - Boosted Skills

‍Legendary and Epic Class Mods get 7 Bonus Points that are distributed randomly. A Skill's maximum Bonus Points depend on its original maximum.

5-Point Skills: 0 to +5 points
‍3-Point Skills: 0 to +3 points
‍1-Point Skills: 0 to +1 points

Confirmative Reality

Tier: 10

Max Points: 3 ➜ 6

Feedback Loop

Tier: 20

Max Points: 5 ➜ 10

Sustained Reaction

Tier: 20

Max Points: 3 ➜ 6

Practical Applications

Tier: 15

Max Points: 5 ➜ 10

Bio-Robot - Stats

In Borderlands 4 Epic Class Mods get 3 random Stats out of these 6 Categories. Legendary Class Mods have 1 random and 1 fixed Stat listed in the About Tab.
Each Stat can appear only once and all are equally common with a 3.125% Chance (1 in 32).

Universal Stats

+26% Damage Dealt
+26% Move Speed
+46% Splash Damage
+46% Crit Damage
+80% Melee Damage
+13% Melee Crit Chance

Survivability Stats

+14,586 Max-Health
+12,502 Max-Shield
+313 Health Regen/s
+33% Damage Reduction
+66% Energy Shield Regen Rate

Weapon Stats

+40% Gun Damage
+26% Fire Rate
+32% Reload Speed
+13% Gun Crit Chance
+60% AR Damage
+60% Pistol Damage
+60% Shotgun Damage
+60% SMG Damage
+60% Sniper Damage

Ordnance Stats

+60% Ordnance Damage
+33% Ordnance Cooldown Rate
+13% Ordnance Crit Chance

Elemental Stats

+33% Elemental Damage
+53% Kinetic Damage
+40% Status Damage
+40% Status Chance

Skills Stats

+60% Skill Damage
+13% Skill Crit Chance
+80% Action Skill Damage
+60% Action Skill Duration
+33% Action Skill Cooldown Rate

Bio-Robot - Changelog

Update: Apr. 30, 2026

Increased Hazard Damage and Radius.

Update: Oct. 23, 2025

Bio-Robot's Hazard Damage on level 50 class mods has increased to 60%.

Bio-RobotHow to get it?

Base Game
General Farming Guidance

To collect and equip the Legendary Bio-Robot, you need to own the BL4 Base Game.

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.