Destroyers

Stygian: "What are you doing to her?" Pony of Shadows: "Forging her into the weapon she is. One that can break worlds." Stygian: "STOP IT!" ―Stygian and his corrupted self

Destroyers, also indirectly referred to as World Breakers or Breaker of Worlds are ponies who contain so much power that they can reshape entire universes, leaving them as dark, empty and devoid of light. The only two known destroyers were Princess Luna and Princess Celestia.