Muramasa/Muramase vs Diamond in mohs scale of hardness; The Muramasa/Muramase both rank an insane 20; The diamond ranks a 10 in the scale; The Muramasa/Muramase were made by a legendary bladesmith, the bladesmith fused the souls of multiple war gods in the Muramasa and fused multiple souls of peace gods to make the Muramase. The bladesmith had made the blades of the Muramasa/Muramase differently from the other swords they made making the blade unbreakable. This bladesmith also was the one who made the sword of creation and the Tyrant's ultrablade.