Fused Fiend originated when a catastrophic power surge at the laboratory's core reactor caused experimental subjects and machinery to meld into a single, nightmarish entity, fueled by mutagenic compounds and electrical arcs. This fusion created a being that now roams the fairways as a living testament to the facility's most destructive failures and the uncontrollable spread of contamination.

Fused Fiend possesses a hybrid form of organic tissue and metallic components, granting it enhanced durability and the ability to emit corrosive bio-electric discharges. Its body constantly shifts and reconstitutes itself, absorbing nearby contaminants to strengthen its mutations, and it moves with unnerving speed, leaving trails of toxic residue that amplify hazard zones. The entity can temporarily fuse with laboratory equipment to manipulate the environment, making it a dynamic and adaptive threat.

Fused Fiend serves as a chaotic instigator within the world, randomly appearing to disrupt players' rounds by triggering environmental hazards and spreading contamination. It forces adaptive strategies and embodies the ever-deteriorating scientific nightmare through its unpredictable fusion abilities.