ataphron Breachers - the name says it all. These are little more than barely-sentient bulldozers, sent into battle by the Tech-Priests to smash their way into fortresses, rumble over squadrons of footsoldiers and dismantle the enemies? battle lines with brutal, insistent power.
Kataphron Destroyers - their name also says it all. A tracked behemoth bristling with incredible weaponry, the Kataphron Destroyers are kept a little further back, aiding the Cult Mechanicus by relentlessly pouring firepower into their foes.