This work presents a high-dimensional, axiomatic model of atmospheric lightning based on the SEXA Unified Field Theory. Contrary to trajectory-based interpretations, lightning is modeled as a quantum vacuum plasma fracture governed by field-closure conditions rather than propagation through spacetime. The framework formalizes resistance polarity, Quantum Vacuum Conduit (QVC) structure, and recursive field coupling across a five-field manifold, providing a mathematical explanation for mid-air lig