Demonic Immortality/Invulnerability

High Class

Demonic Immortality:
Only Angelic Weapons Can Kill You
NOTE: ONLY THE STRONGEST DEMONS HAVE THIS
Demonic Invulnerability:
Only Powerful Magical Weapons can harm you

Medium Class

Demonic Immortality/Invulnerability:
Only Powerful Magical Weapons can harm you

Low Class

Demonic Immortality:
Only Powerful Magical Weapons can kill you