Once a hermit who lived beside the creek's ancient stone weir, this solitary figure was transformed when upstream construction disrupted the natural water flow patterns he had studied for decades. The artificial interference with sacred water channels awakened dormant magical abilities, binding his essence to every dam, spillway, and water control structure in the watershed.

His waterlogged robes flow and ripple like spillway discharge, constantly dripping yet never fully drained. A gnarled staff topped with miniature working water gates allows him to remotely manipulate any artificial water control structure within the creek system. His form shifts between solid flesh and flowing water, becoming more liquid when actively channeling magic through the infrastructure network. Ancient knowledge of hydrology combines with supernatural power to predict and control exactly when conditions will be optimal for creature emergence.

The Weir Warlock serves as the strategic mastermind behind the timing of supernatural events, using his control over dams, weirs, and spillways to create the precise water level and flow conditions needed for maximum creature emergence and fog density. His manipulation of artificial water infrastructure transforms human-built flood control systems into supernatural amplification networks.