Webadditionally, an even stronger version of this weapon, crimson red nichirin blades, can be achieved by raising the sword’s temperature to extreme levels,. Webnichirin blades, aka nichirin swords, are forged from scarlet crimson sand and scarlet crimson ore, both found on mt yoko. These blades are specifically made for. Webnichirin blades are made out of a combination of scarlet crimson iron sand and scarlet crimson ore. These materials can only be found on selected mountain peaks. Webnichirin swords (among other nichirin bladed weapons) are the main weapons used by demon slayers in the demon slayer corps in order to kill demons. They are forged with. Webunveil the hidden meanings behind the colors of nichirin blades. Explore the symbolism and significance of each katana color in demon slayer. Webit seemed like she was terrified to let her brother face off against the demons, but in reality, she was trying to enhance his brother's sword's attacking abilities by. Webbright red nichirin sword (赫 (かく) 刀 (とう) kakutō?, viz. Bright red blade) refers to the ability that turns a nichirin sword bright red with special properties for a certain. Webwhen using this power nichirin swords can hinder a demon’s healing abilities, similar to the effect that sunlight has on them.