After Kappara's final battle with the shadow overlord Jackal he was left mutilated by the corpse of the massive creature. With his crew gone, and no way to return to his regeneration tank his blood had no other choice but to use his immediate surroundings to repair him. Thus the greater shadow material was assimilated into him changing his body and armor into something new an more powerful then before.
Since all of a Drio's equipment is grown with them their nanite enriched blood will constantly replace lost or destroyed equipment. The result of Kappara's blending assimilation of the greater shadow material left him with an incredibly powerful weapon, The Shadow Blade.