Blackhole Sun

You unleash a mass of 4 unstable black holes that converge on each other at the target, creating mass devastation in a 1 mile radius for a 1 round duration. All creatures that touch, or are within the 1/2 mile center radius die instantly. All creatures that start there turn in the outer 1/2 mile radius must make a DEX save, on a failure they take 100d20 Unresistable Force damage or half as much on a success.

While casting this spell you must keep concentration, you can't move, take actions or bonus actions. You may use reactions, but if you do you must make a CON save equal to 9 plus the level of the spell cast or equal to half of any melee damage you dealt (minimum 10). If you lose concentration your spell slot is used to cast this spell blocked and can't be regained without the use of a Greater Restoration or Wish spell, you also gain 1d4 levels of exhaustion.

On a successful casting of this spell and after it ends, arcane sigils etch themselves painfully onto your body, you are afflicted with the following conditions based on the number of times you've cast this spell:

1st casting:

• You gain 1d4 levels of exhaustion.
• 1d6 of your spell slots from highest to lowest level are blocked and can't be regained without the use of a Greater Restoration or Wish spell.

2nd casting:

• You gain 4 levels of exhaustion.
• 2d8 of your spell slots from highest to lowest level are blocked and can't be regained without the use of a Greater Restoration or Wish spell.

3rd casting:

• You die instantly.
• Your soul and body are disintegrated.
• No method, including the Wish spell, can revive you.