**“Aurora Core Pulse Rifle”** is the common name for *Arcanum photothermis*, a late‑era experimental energy weapon developed during the shift from chemical propellants to contained‑core photonic discharge. Its signature swirling chamber wasn’t decorative, it housed a stabilized aurora‑reactive plasma coil capable of converting ambient electromagnetic fields into coherent pulse fire. Originally built for precision engineering crews working in magnetically volatile zones, the rifle’s unexpected purpose emerged when researchers discovered its pulses could harmlessly neutralize unstable energy pockets. This made it invaluable in deep‑lab environments where traditional tools failed. Today, *A. photothermis* is remembered less as a weapon and more as a scientific instrument disguised in battlefield form.