Giyu's katana is broken by Akaza during the Infinity Castle arc, but Sanemi tosses him another Water Breathing user's sword that allows Giyu to continue fighting. Red Swords Exemplify the Burning ...

Known also as Sun Blades, Nichirin Katanas are the most common weapons used by the Demon Slayer Corps, crafted with Scarlet Crimson Iron Sand and Scarlet Ore by the relentless Swordsmiths.