Twilight of the Idols

You become a black hole of divine energy, emanating a 60-foot aura of absolute anti-divinity that suffocates the power of any god or cosmic entity. For the duration, the aura moves with you and enforces the following cosmic rules:

• The Mortifying Zone: Every creature of your choice within the aura loses all damage immunities and damage resistances. They take damage normally from all sources.
• Divine Suffocation: If a creature within the aura attempts to cast a spell of 1st level or higher, it must first succeed on a Constitution saving throw against your spell save DC. On a failure, the spell fails, the action is wasted, and the creature takes 1d12 Psychic damage per level of the spell slot spent.
• The Killing Blow: While inside the aura, any creature that rolls a 1 on a saving throw or is hit by a critical hit takes an additional 5d10 Force damage. If this damage reduces a Celestial, Fiend, or Fey to 0 hit points, its body instantly turns to grey ash and it cannot be resurrected by any means short of a Wish spell cast by a greater deity.