Since the era of the legendary swordsman Yoriichi, the Nhat Luan Sword turning red when fighting has almost become a legend because no one can do it anymore.
However, that legend has reappeared in the current generation of demon-slaying swordsmen, similar to the previous golden age of the Demon Slayer Corps.
The most important secret is temperature
Details in chapter 189: Snake Tru finds a way to turn the sword red through Ha Tru’s case.
This happened in the most crude way when in chapter 112, Nezuko used her fire to burn Tanjiro’s brother’s sword red.
With this method, the swordsman does not need to turn on the Seal to be able to perform.
The next secret lies in the swordsman who carries the Seal
We all know that when the Press is turned on, the body temperature exceeds 39 degrees Celsius and the heart rate exceeds 200 beats/minute.
Grasp the sword tightly like a metal pliers, push the body’s limits to the threshold of life and death and the blade will turn red – that is the Iguro Serpent’s way of achieving the necessary temperature.
This method has a huge disadvantage in that it easily exhausts the user’s strength. Iguro immediately after performing it was dizzy and almost fainted.
Also from an accidental weapon collision with Sanemi’s Wind Pillar in the match with Supreme Kokushibo, Himejima’s Rock Pillar found another method: Increase the weapon’s temperature by friction when they collide.
Right at that collision, Himejima discovered an important clue but had no chance to verify it, so Muzan’s attack was too strong.
Following Himejima’s success, the Wind Pillar Sanemi did the same by crossing swords with the Water Pillar Giyu.
Heat the sword, put all your strength into holding the sword firmly, and tap the sword.
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