The Rust Robot began as an environmental monitoring drone deployed to study the creek's pollution levels. After sinking into the murky depths, it was infused with the ancient spirits awakened by the disturbance, transforming into a vengeful guardian of the waters.

Composed of rusted iron and decaying electronics, the Rust Robot moves with jerky, unpredictable motions. It is nearly impervious to physical attacks but short-circuits easily when exposed to water or electricity. Its optical sensors glow red, cutting through the densest fog, and it emits a constant low-frequency hum that disrupts concentration.

It roams the creek's most polluted sections, aggressively defending against any intrusion and serving as a grim reminder of the ecological costs of human industry.