Hellex Plasma Mortar

The Hellex Plasma Mortar is a plasma-based artillery system used by the Thanatar-class Siege Automata of the Legio Cybernetica during the Great Crusade and Horus Heresy eras of the late 30th and early 31st Millennia. The Plasma Mortar fires high-density charges of burning plasma timed to detonate over their targets.

These airbursts create rolling waves of incinerating energy which engulf the surrounding area and a re particularly useful in siege warfare, since they can be used to bypass static defences and strike at the soft heart of fortified positions.