In Demon Slayer, a Nichirin sword is a special type of katana that absorbs sunlight and is crafted from materials known as Scarlet Crimson Iron Sand and Scarlet Ore, fictitious substances that ...

The Yoriichi Type Zero sword is the same Nichirin katana that Yoriichi Tsugikuni carried during his time as a Demon Slayer. It is deep black in colour and changes to bright red during combat, a ...