The Thunderer siege tank

The Thunderer Siege tank is a conversion of the Destroyer Tank Hunter. The advanced technology of the tank hunter’s main weapon is difficult to manufacture and repair if the weapon malfunctions or is damaged in battle. Rather than waste an armoured vehicle chassis the Adeptus Mechanicus often re-gun the tank hunter chassis with a different weapon. A common conversion is to replace the damaged Laser Destroyer with a Demolisher cannon, to fill the role of the Demolisher. It is possible that some Thunderers have been produced as new build vehicles.

This vehicle is used by commanders whose forces are required to fight in dense terrain, and often find that a regiment will not have enough Demolisher tanks to directly support all the infantry platoons.

Like the more heavily equipped Demolisher, the Thunderer is usually deployed in close support of infantry platoons, lacking the range to engage enemy tanks in the open.