Immortal Swords

Alternately called the Everlasting Blades. They are a series of seven weapon manifests which continued to exist after their creator's death and have begun to Exhibit strange properties. Upon awakening, as an everlasting sword, the blade gains a boon, a special power it itself can cast endlessly based upon the actions of the blade during its life.
 * 1) Everlasting Sword of Mist
 * 2) Everlasting Sword of Rain
 * 3) Everlasting Sword of Cyclones
 * 4) Everlasting Sword of Gathering Clouds
 * 5) Everlasting Sword of Heavenly Thunder
 * 6) Everlasting Sword of Dawn Light
 * 7) Everlasting Sword of The Sky

"The swords unbreaking properties appear to be a form of glitch. All of the everlasting blades are said to be cursed. That is not to say they place a curse upon their wielder or even those around them. Nor do I mean they are destined through action to bring about misery. Rather the blades are cursed in the truest sense of the word. The blades themselves exhibit a grotesque kind of sentience. Some claim it to be the trapped souls of their former creator, being everlasting because their user never truly died. This is to misunderstand the true nature of these blades."

There true forms are difficult to perceive however for one with adequate eyes... It would seem my hypothesis was correct. The blades have come to life, not just possessing a will and soul of their own, but also a body. Biological and deeply ugly and unformed.

Trivia
Maria's "Hate Buster" is classed to likely become the 8th Immortal Sword