Borderlands 4 Bio-Robot Review — Legendary Class Mod
| Rarity | Legendary |
|---|---|
| Type | Class Mod |
| Drop source | Idolator Sol, Fortress Indomita |
Red Text
This place is not a place of honor.
This review was machine-translated from the Japanese original. Numbers are checked against the original; if the wording reads oddly, the Japanese version is authoritative.
Each time you Entangle, it alternately sprays Cryo and Radiation hazards (danger zones), and the hazard damage gradually chips away at enemies—a gas‑spraying type class MOD. The more you hit Entangle with Harlowe, the more the floor is covered in danger zones, and the dedicated Hazard Damage increase extends sustained firepower. It is aimed at Harlowe focused on area suppression and status effects.
🧩 Source of the red text A passage from the “Long-Term Nuclear Waste Warning Message” created by Sandia National Laboratories in 1992 (“This place is not a place of honor… no highly esteemed deed is commemorated here…”). It was a message intended to convey the danger of nuclear waste to people ten thousand years in the future, later spreading as a copy‑paste meme. This MOD directly references that for its Radiation Hazard (radioactivity) theme. The existence of the text has been confirmed (Wikipedia).
What kind of class MOD? (Beginner’s perspective)
- Harlowe (Gravitar = Gravitar line) dedicated Legendary class MOD
- Theme is Hazard (danger zone) spraying from Entangle
- Every time you Entangle an enemy, alternately generate Cryo Hazard and Radiation Hazard on the floor
- Trap enemies in the generated danger zones to earn sustained damage
- Dedicated stat +Hazard Damage (Hazard Damage increase) = the firepower of the sprayed danger zones increases = fits area suppression / status‑effect‑focused playstyles
Unique Effects (Mechanics)
The dedicated stat
+N%is a level‑dependent reference value (added 2026-08-06) The+N%below originates from Lootlemon / MentalMars. In the actual game, the dedicated stat values change with Lv (only the stat type is fixed, not the numbers).
- Measured: duration and damage types are Lv45 = +41% / Lv47 = +43%. Other MODs / other VHs have the same values at the same Lv (not dependent on individual rolls or prefixes) = provisional formula
value% = Lv − 4- According to this formula, the Web’s
+45%is written as a fixed value equivalent to Lv49- ⚠️ Whether numbers from other lines such as
+23%/+60%follow this formula is (unverified) (CD speed types may be Lv‑independent with +23% at Lv45/47).
Bio-Robot: Harlowe whenever it Entangles an enemy, Cryo Hazard and Radiation Hazard are generated alternately. Dedicated stat +Hazard Damage.
- In‑game: Entangle alternately generates Cryo Hazard and Radiation Hazard
- Web (Lootlemon): Whenever Harlowe Entangles an enemy, she creates alternating Cryo Hazards and Radiation Hazards. Always comes with the unique Stat: +Hazard Damage (Lootlemon notation +70% – varies by patch (unverified))
- Dedicated stat +Hazard Damage (Hazard = danger zone damage increase. Displayed value varies by patch (unverified))
- Skill bonus (+N): added to Confirmative Reality / Feedback Loop / Sustained Reaction / Practical Applications lines (target skills and bonus values vary per individual / icon display (unverified))
- Weakness: Benefits are Entangle‑dependent = builds that do not use Entangle cannot spray hazards and may become a death‑making ability
Drop Farming
| Drop Source | Chance | Notes |
|---|---|---|
| Idolator Sol (Fortress Indomita) | (unverified) (Lootlemon notation 6.75% – Harlowe) | Boss drop |
Build Synergy
- Core of Entangle‑centric builds: continuously spray Cryo / Radiation danger zones with rapid Entangle, earning sustained firepower via Hazard Damage
- Status effects / area pull: with the dedicated +Hazard Damage, it directly synergizes with skills/equipment that boost status‑effect or area damage
- Crowd‑control playstyle: holds enemies in danger zones while chipping away, pairing well with suppression‑oriented tactics
- *The skills that receive the bonus differ per individual (i.e., a selection point).
Summary
- Harlowe (Gravitar) dedicated. Core that sprays Cryo / Radiation Hazards with each Entangle – a gas‑spraying type core
- Dedicated +Hazard Damage extends the sustained firepower of danger zones
- Benefits are Entangle‑dependent = for Entangle builds
- Obtained from Idolator Sol (Fortress Indomita)
Related
- Same class line (Harlowe / Gravitar): Driver / Generator / Reactor / Scientist / Skeptic / Trooper
- Reference: Lootlemon - Bio-Robot
- Same category (Class Mod): Avatar / Blacksmith / Buster
- Same rarity (Legendary): Firewerks / Jelly / Lead Balloon
FAQ
What is Bio‑Robot’s unique effect?
Whenever Harlowe Entangles an enemy, it alternately spawns Cryo and Radiation hazards. Provides the exclusive +Hazard Damage status.
Where can I obtain Bio‑Robot?
It drops from Idolator Sol in Fortress Indomita.