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Borderlands 4 Guide

How to Unlock the Legendary Bio-Robot Gravitar Class Mod

Class Mods
Legendary Loot
Updated on Oct 1, 2025
Oct 1, 2025

Overview

Bio-Robot is a Gravitar Class Mod for the Vault Hunter Harlowe.

Her Bio-Robot Class Mod makes her spawn hazards combined with her action skills Harlowe:

Entangling Enemies with your Action Skill causes them to create alternating Cryo and Radiation hazards.

borderlands 4 bio-robotclass mod

Thanks to Imortilize for providing the information and check out all Harlowe Class Mods here!

How to Get

Unlock Location:

  • You will have to make your way to Fortress Indomita.

borderlands 4 fortress Indomita

Farm Method

  • Defeated Idolator Sol in the Campaign.
  • Defeat Idolator Sol who can drop Bio-Robot.
  • Farm until Bio-Robot drops.

Nearest Fast Travel

  • Someday Rise (Safehouse)

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