The ability to be nonexistence to spirituality.
The user can be nonexistent to all things spiritual, including religion, spiritual powers, or can even function without a soul.
- Immortality/Resurrection: death is usually affiliated with a spiritual afterlife, but nonexistence to spiritual things would allow the user to ignore death or slip from its grasp.
- Invulnerability against spiritual powers.
- Soulless Being
- Spiritual Intangibility
That's just a rough idea, so let me know what you think.