The Legion Land Raider Proteus was the elder form of the Imperium's greatest battle-tank, distinguished by the sophisticated auspex and explorator arrays built into its hull, and few Legions appreciated those instruments as keenly as the Thousand Sons. To a brotherhood of scholars who treated every battlefield as a problem to be understood before it was solved, a tank that could see farther and map the unknown was a treasure in its own right. The Proteus carried the Legion's precious cabals and Sekhmet veterans through the heaviest fire and set them down where their sorceries would prove decisive, its thick armour a rare guarantee of safety for warriors the XV could ill afford to lose. Its lascannons gutted enemy armour as it advanced, but its truest gift was survivability, ensuring that the irreplaceable minds it carried lived to work their art. On Prospero, such tanks bore the Legion's counterattacks into the streets of a burning Tizca.
Order of battle
