Nichirin Blades are special blades used by and made specifically for the Demon Slaying Corps to slay Demons. They are forged from a unique ore that constantly absorbs sunlight, one of the only major weaknesses of Demons. Therefore, decapitation by Nichirin Blade is one of the only ways a human can kill a Demon, the other being the use of a Wisteria-poison coated weapon.
Nichirin Blades take on a distinct color when first drawn by its owner, which is why they are also referred to as "The Color Changing Swords". However, the holder is required to have a certain amount of skill, or the blade will not change color. Tanjiro Kamado, wields a black Nichirin Blade, but the symbolism of the black blade is unknown. The reason for this is because black blades are seen as a rarity, as demon slayers who wield them don't have a tendency to live long, let alone becoming a Pillar of the Demon Slayer Corps.
- Blade: The blade of the sword has been constructed from stainless steel and comes slightly sharpened and has a black finished.
- Scabbard: The scabbard is constructed of wood with silver accessories
- Handle: The handle of the sword is a nylon black wrap with red inner wrap.
- Blade Material: 440 Stainless Steel
- Overall Length: 41"
- Blade Length: 30"
- Handle Length: 11"
