Translated from official site:
"The ancient existed Blade was unable to generate weapons, and the relationship with the driver was also thin.
Although Blade was able to exercise arts by itself, its power was limited and the effect of Blade Arts used for the driver was also insignificant, so the operation on the battlefield was also a human assistant role It was said that it did not exceed.
Eventually, the relationship between the driver and Blade will change completely, as soon as there were only a few but a Blade with weapons was born.
It turned out that the power of Arts was multiplied by using the Blade's weapon by the driver.
In addition, every time the driver uses the Arts, a part of the ether energy sent to the weapon is purified, compressed, accumulated, and the Blade releases it, thereby making it much more powerful attack than ordinary art - - It became possible to carry out "Special Moves".
In addition, the drivers who use weapons have confirmed secondary effects such as extraordinary muscular strength, durability and agility (bottle shoes) can be demonstrated during engagement with Blade, although there is a difference in degree, and the relationship between the two He quickly became closer.
This special tactic is said to have been invented by a driver and Blade of Old Kingdom Era, but no official record has been left.
Whatever the inventor, this revolution of relationship will establish a way of fighting the driver and Blade together, the Blade without weapons will gradually be culled and eventually all the Blade will have weapons In the state, it will come to be born.
From this, it can be said that "the principle of survival of the fittest" also applies to Blade."
