Immortality

Immortality (不死, Fushi, English Viz: "Regeneration Magic") is a legendary lost ancient magic that was used during the Grand Magic Games, used by Zatsu Aelos.

Overview
The user is capable of regenerating any part of their body, and even gain new cells and matter. Even if his entire organic structure (organs, skins, nerves etc) were vaporized, the conscious is transferred to the magic energy, and thus uses to completed restored body.

Strengths

 * Immortality - The magic makes virtually the caster nigh-immortal, able to regenerate from any attack.
 * Absolute Immunity - Having this, the user is completely immune to all diseases and viruses (except to magic-related).

Weaknesses
Despite being a powerful magic, able to literally come back from anything, it still possess drawbacks.
 * Magic - The magic still need Magic Energy to be used. If the users runs out of magic when they "die", they can not restore their body.
 * Pain - The user can still feel all pain. The great example of this shown in the Grand Magic Games during the Naval Battle, where Zatsu's body was being vaporized by Hell Knight as soon it was restored for 2-5 minutes. When he Knight was done, the female mage model gently grabed him, and was able to bring him to the ground. When Zatsu's members got there, Ztasu instantly reached for Amari, and they saw he was shaking, as if he came from Hell itself. With help from Wendy Marvel, Zatsu was finally able to calm down from the horrifying experience of being "killed" for 5 minutes.