Immortal

Immortals cannot be killed, unlike mortals. They tend to be demigods at least, but the category includes gods and some monsters as well.

Immortals are immune to death in any conventional form. They do not age nor can they die from poison or disease. They are immune to weapon not forged from magical metals such as celestial bronze or stygian iron. If their body is destroyed they will eventually reform. The time period for this various from months to close to a century.

Immortaility does have its limits. If an immortal being suffers a wound great enough they may be weakened to a point where they can no longer reform reducing them to near nothing as in the case of Kronos. They can be sealed in the pit of Tartarus or some other prison. They can even "fade" away into nothingness ceasing to be if they lose the will to live as what happened to Helios.