The cannon consists of a turret-mounted linear accelerator that fires magma bomb warheads of much higher calibre than regular torpedoes at a much higher velocity. Its primary function is planetary bombardment, which is used in support of Space Marine landing forces. This suits the battle tactics of the Adeptus Astartes quite efficiently. Thus a single vessel can bombard an area of planet, then immediately deploy drop-pods containing battle-brothers to mop up the confused opposition. It can be used in ship-to-ship combat to great effect. The high power of the warheads will literally render armour plating irrelevant, and can tear an enemy vessel to shreds in mere moments.