Azareck's Cosmic Retribution

Blast your enemies with the wrath of the cosmos, a cone of energy that resembles the night sky scattered with stars.

All those caught in the cone must make a Dexterity saving throw, taking 10d12 Force damage on a fail and half as much on a success.

Furthermore, on a fail the target is stunned for 1 turn and they must make a Charisma saving throw at the beginning of every turn for 5 turns, on a fail they take 1d6 radiant damage and on a success they take half damage. 

Creatures reduced to 0 hit points by this are disintegrated and can only be resurrected via True Resurrection or Wish.   

At Higher Levels: When cast with a 9th level spell slot, the initial damage increases by 2d12.