Kyōtetsu

is a conceptual weapon manifested through the technique Tamahagane. Unlike the weapons Kazuhide has forged with the same technique, Kyōtetsu is a blade that was naturally formed within his subconscious over a decade before he became aware of its power. During this time the blade passively awarded Kazuhide unique abilities, and subtlety influenced the development of his fighting style. Due to both the active and passive properties of the blade, it has has been referred to as the.

In terms of simple abilities Kyōtetsu is a dark colored katana possessing a peerless edge and unnatural durability. This ability was best demonstrated through the clashes with Chikakage and Nagamitsu, two swords containing incredible power. More specifically, Kyōtetsu was able to withstand the blows of Chikakage, a blade forged from a, and damage Nagamitsu, a sword whose durability surpassed stabilized Tamahagane weapons. Furthermore, Kyōtetsu was ultimately responsible for the destruction of both of of those previously mentioned swords.

In addition to the physical characteristics of the this so called Sacred Sword, Kyōtetsu boasts a unique set of abilities focused around the interaction with forces that that interfere with this world. Passively, this has awarded Kazuhide with the ability to perceive otherwise invisible otherworldly entities, including disembodied souls, and residual disruptions caused by. The blade itself can interact with these disruptions, a feat far beyond the potential of most physical and -based armaments. As such, it becomes possible to for the user strike and defend against the previously mentioned otherworldly entities, and it can even be used to deal lethal damage against disembodied souls and the souls of individuals resurrected with. It should be noted that the souls of living individuals cannot be damaged as long as it remains bound to their body. When it comes interfering with the residual disruptions of space–time techniques, Kyōtetsu is able to temporarily rend open the fabric of space where such a technique recently occurred. In doing so Kazuhide is able to hijack the pathway formed by the original technique, or potentially free himself from being trapped in alternative dimensions. If employed during the use of certain space–time techniques, it even becomes possible to disrupt their formation and effectively negate their activation.

It is due to the active properties of Kyōtetsu that the blade is particularly well suited for use with chakra-based, which can extend the range of its abilities and apply them in more complex manners.