Nichirin Blade

A Nichirin Blade, also known as a "Sun Steel" sword, is a special weapon used by demon slayers in the anime "Demon Slayer." Made from a unique ore that absorbs sunlight, these blades can eliminate demons, which are otherwise nearly invincible. The color of the blade changes based on the user’s personality and training, and each blade is tailored to its wielder. The Nichirin Blade is not only a weapon but also a symbol of the demon slayers' commitment and skill in their fight against demons.