Holiness
A holy deity, being, creature, spell, or thing is considered to be on the side of celestials with a tendency toward goodness, and as such counter to unholy deities, creatures, beings, and things on the side of fiends, undeath, and evil. A sanctified being confers Holiness or Unholiness onto its acts and magic.
Holiness is associated with altruism and assistance, and Unholiness is associated with inflicting harm on victims. The two natures each hold a metaphysical form of Divine Power that is exclusive of and vulnerable to its counterpart.