Though early marks the V-series inundated their pilots with deadly radiation, later models were able to account for this problem, at which point Battlesuits began to be a mainstay of the military forces of the Tau Empire. It was not until the end of that first period of rapid growth that Battlesuit technology began to regularly appear within the Hunter Cadres. Not surprisingly, it was at these final stages that the Tau won their largest battles, as elite formations of newly-trained Battlesuit pilots began to refine their tactics to take advantage of what their armoured suits could do. By the start of the Second Sphere Expansion, great strides had been made in Tau Battlesuit design, particularly in the areas of power sources and the increased potency of weapon load-outs. By the end of this