Futsunushi

Futsunushi is a very powerful and legendary form of Holder Magic that revolves around swords. It's so powerful that throughout its long history it has only had to users. Its creator and Kenshin Hoori. The latter didn't learn this magic, but rather had it awakened inside him by Origin Magic as if it was his to inherit. This was one of the main reasons he was given the alias: God of Swords.

Description
Futsunushi is a form of Holder Magic developed to be a far superior version of Sword Magic. When learning this magic a user must build their sword from nothing but their own magic power. This is done by transforming their magic power into the materials they need. This creates a very close and inseparable connection between the user and the sword. This very connection serves as the basis of Futsunushi.

Using the connection, the sword is able to constantly replicate the attributes of the user’s magic origin. This causes it to constantly draw in large quantities of ethernano and convert it into a unique form of magic power called sword essence or sword power. As the name suggests, this energy is the very soul of the sword. Users of Futsunushi gain absolute control over this form energy. Since sword essence defines the sword, manipulating it grants the mage the ability to alter everything about the sword such as its form, attributes, and what it is made of. This allows the user to perform feats like transforming blade into an element or increasing its heat.

When it is released, the user is able to control the energy to perform combative feats only. When it cloaks the sword, sword essence gains the unique trait of manipulating anything that may limit the sword. This includes physical forces like gravity and kinetic energy. The physical forces can only be manipulated to in ways that affect the sword and the sword alone, greatly limiting what the user can do. Regardless, this makes the sword virtually unstoppable under normal conditions, typically forcing opponents to dodge it because it is their only option.

The sword isn’t the only thing to benefit from the connection. The connection allows makes user’s absolute invulnerable to any sword. They are also able absorb any sword that touches them, making impossible for them to be beaten in duel with swords.

As a user of Body of Sword’s, Kenshin isn’t limited to using the abilities of Futsunushi through his sword only. Since his body his made of swords, he can flow the energy into his body, which is a feat that would otherwise be impossible. This allows him to alter his body in the same ways he can alter his sword.