Hengen Muso

The Hengen Musou Style (変幻無双流) is a legendary fighting style that was born out of the desire to save the world without having to rely on the Heroes. It is said to have never lost on the battlefield. The last practitioner, Elrasla Grilaroc, said that the style was no longer needed in this world and planned to take it with her to the grave. However, after being helped by Naofumi, she decided to pass on the legend for the sake of the world. There is no specific weapon associated with Hengen Musou Style; it does not require a medium, but anything can be used as a medium.

History
The inventor of the Peerless Transformation Style was an adventurer who wanted to overcome danger without relying on the Heroes, so he founded the School.

It's a legendary style that is said to have never lost on the battlefield. The style has left its mark on the histories of countries around the globe. Just like the Four Summoned and Seven Star heroes. However, half a century ago, internal discord caused the death of a majority of its practitioners, and those left all swore to never pass it on. The Hengen Musou style was brought to ruin through internal discord caused by a prodigy who concluded that he was the one worthy of ruling the world, a way of thought forbidden by the school's teachings.

The last remaining practitioner said that the style was no longer needed in this world, and planned to take it to the grave with her. But after being helped by Naofumi, she decided to pass on the legend for the sake of the world.

Abilities
There is no specific weapon with Hengen Musou Style. Hengen Musou Style is an all-around combat art that utilizes a wide variety of weapons to fight different kinds of enemies.

One technique of the Hengen Musou Style is used to beat people with high defense, performed by assessing the opponent's internal spirit and inject the user's own magic power to cause a disturbance and make the opponent's magic power run wild. However, this technique can be reversed by redirecting the power outside of the defender's body before it begins to get out of control.

Musou Kassei
A technique for sucking in Chi from the air as a sort of a boost skill. Maintaining Musou Kassei for long periods is dangerous, as the body cannot sustain it indefinitely. Mussou Kassei artificially creates something similar to SP, which can increase the effectiveness of Magic.

Chi
Chi is the basis for Hengen Musou. Like magic, every person has Chi in their bodies. Some, however, have more talent than others in manipulating it like Rishia and Atla. Rishia was said to be able to learn almost if not all of it, having a talent found only once every 100 years. Atla has innate talent and perceives the world around her through sensing Chi. The Four Legendary Heroes all have irregular Chi flows which prevent them from using Hengen Musou, though they can counter Hengen Musou if they train their Chi properly.

Peerless Activity
Peerless Activity is the time period in which Chi is actively being used. Eclair is only able to use it in bursts while attacking or avoiding while Rishia excels at maintaining peerless activity for an extended period of time on a low level, but she can also use it in powerful bursts. In essence, it acts as an ‘Overdrive’ skill, giving the user a boost to their abilities for a certain time.