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