Aura of Protection or Destruction

When you cast this spell, you radiate an otherworldly energy that warps the fate of all creatures within 30 feet of you. Decide whether to call upon either a celestial or a fiend for aid. Choosing a celestial charges a 30-foot-radius around you with an aura of nonviolence; until the start of your next turn, every attack roll made by or against a creature inside the aura is treated as a natural 1. Choosing a fiend charges the area with an aura of violence; until the start of your next turn, every attack roll made by or against a creature inside the aura, including you, is treated as a natural 20.