Kyōitekikasei

Kyōitekikasei (驚異的火災, Phenomenal Conflagration) is a sentient, living sword with the ability to utilize the and  nature transformations. It is the embodiment of and the sister sword of Mizōarashi.

Abilities
Kyōitekikasei possesses the innate ability to simultaneously produce and  natured chakra as well as Fire and  nature chakra to form the  and  nature transformations. Using a diffusion and fusion similar to the Dual Collaboration Technique, it can produce other advanced natures when paired with chakra from the user or Mizōarashi. Because it is sentient and living, Kyoitekikasei possesses its own chakra and can psionically communicate with its wielder, relaying its thoughts, emotions and will to the user instantaneously. Depending on the relationship it shares with its wielder, it can either choose to fuel its attacks with the wielder's chakra, it's own, or a mix of both. The depth of the relationship also determines how much chakra is used to create a technique; a good relationship can get the best out of a technique at the expense of less chakra. The weapon is capable of using a multitude of elements simultaneously.

Attacks and techniques of Kyoitekikasei are in nature, which allows it to replenish its supply of chakra as well as the users. Even if the blade runs out of chakra, the blade itself won't die. If the wielder runs out of chakra while using it, they won't die, even if the weapon is out of chakra. While the reason behind this phenomenon is unknown, it's possibly due to the psionic connection the weapon and wielder share.

When utilized with Mizōarashi, the user gains access to the, and Kyoitekikasei can divide its natures into base components and rearrange them with those of Mizōarashi, allowing them to generate other advanced natures. If the user possesses different, they can channel their chakra into the blade and rearrange them with that of the sword to produce an advanced nature. When both blades are mastered, the user can utilize any nature transformation at will, while also gaining access to two, unrestricted s. These orbs of black chakra are to their normal counterparts in that they aren't weak to  techniques nor do they possess a range limit. At any given moment, the user can cease the black orbs before instantly reforming them near themselves again.

Utilized Techniques

 * Nature Synergy Mode

Trivia

 * Because of its immense affiliation with the, the sword can be use to cast extremely powerful and efficient capable of fooling even , as well as give form to imagination.