Yoriichi katana
Yoriichi uses the Breath of the Sun, so his Nichirin katana is made up of black and red, and the red Nichirin katana is only the strongest because the Breath of the Sun is the source of all the Breaths, and when Yoriichi uses the Breath of the Sun to empower the Nichirin katana, the blade will turn a blood red color, sometimes glowing a bright gold color.
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