The Melta Cannon works by sub-molecular thermal agitation in a manner comparable to microwave irradiation. This formidable heat-based Plasma Weapon induces a minute, sub-molecular nuclear fusion reaction within a highly pressurized pyrum-petrol fuel mix, and then projects the resulting plasma from the barrel as a blast of super-intense heat capable of melting plasteel or plascrete, and its devastating effects instantaneously evaporate living tissue, as all moisture vapourises explosively. The Melta Cannon makes no noise when fired, but the super-heating of the air produces a distinctive hiss which becomes a roaring blast. The one drawback to this weapon is that it can only be used effectively at close range, so it is employed for close assault and support.