Mastodons

The Mastodon Heavy Assault Transport, or simply the Mastodon, is a super-heavy assault transport that was utilised by the Legiones Astartes during the Great Crusade and Horus Heresy eras. The Mastodon was one of the heaviest assault transports ever used by the Space Marine Legions, and was reserved for use against only the most heavily fortified of enemy positions.