The Battle of Castobel
Tau technology is the product of the Earth Caste, and it is thanks to their innovations that the Tau have expanded their empire so rapidly. Tau military technology is extremely advanced, predominantly a mixture of high energy plasma weaponry and rail guns. The rail gun is particularly potent and its technology is eagerly sought by certain factions within the
Adeptus Mechanicus. Anti-grav technology similar to that of the Eldar is widely employed by the Tau in their Hammerhead tanks and Devilfish armoured transports. These technology bases are carried over into non-military applications. Certain items of Tau technology are in the possession of the Imperium, mainly confiscated agricultural and construction equipment seized on frontier worlds from settlers who have traded with Tau merchants. Such technology has been transported back to Mars for further study, where the Adepts of the Machine God hope to penetrate its secrets.