An extremely powerful katana would be forged from a legendary metal

An extremely powerful katana would be forged from a legendary metal, known for its unique strength and malleability. It would be decorated with ancient symbols and mystical engravings., infusing it with the power of ancient gods and guardian spirits. Its edge would be so sharp that it could cut through any material, effortless. Furthermore, It would grant its bearer superhuman abilities, such as increased speed and heightened reflexes. The simple act of wielding this katana would inspire terror in any opponent., becoming not just a weapon, but an extension of its master's will and power.