When construction upstream disturbed the ancient equilibrium, dormant demonic entities bound to protect sacred water collection points awakened from centuries of slumber. Basin Fiend emerged as the most aggressive of these territorial demons, claiming the deepest basins as its domain and viewing any approach as an invasion to be violently repelled.

This hulking demon stands seven feet tall with water-darkened crimson skin and muscular limbs ending in webbed claws designed for aquatic combat. Barnacles and algae have fused with its hide during its long submersion, while its eyes burn with sulfurous light that pierces through even the densest fog. Its breath creates scalding steam clouds when it surfaces, and its roar echoes across water with supernatural resonance.

Basin Fiend actively claims and defends the deepest water collection points on the course, creating no-go zones that force players to dramatically alter their strategies. Unlike other entities that watch or stalk, it launches immediate attacks on anyone who approaches its claimed territory.