The soldiers of the 34th Psian Vipers make up a tenacious regiment, even for the Militarum Tempestus. This has been proven on numerous occasions, but none more effectively than on the industrial Agri-World of Marunda II. In 998.M41 the Imperial mining operations delved too deep into the planet's crust and disrupted dormant Necrons. The awoken warriors marched through the colossal tunnels, their gauss weaponry flickering off walls and ancient machinery as they atomised thousands of menials and servitors. The vast regiment of the 34th Psian Vipers made planetfall and descended into the tunnels in their Taurox Primes to strike at the heart of the alien threat. They blasted away at swarms of Scarabs while their vehicle-mounted volley guns vaporised dozens of implacable Necron Warriors.