The All Terrain Megacaliber Six (AT-M6), is the largest and most powerful variant of walker in Galactic History. It was used by the First Order to replace the AT-AT. They were named because they had a Megacaliber Six Cannon, which was as powerful as the turbolaser batteries of a Resurgent-Class Star Destroyer. The body of the AT-M6 was covered in thick armor that was too powerful for any Resistance starfighter to destroy.