Boom

You charge as much energy as you can to generate a gigantic explosion, that destroys everything in its wake.

When this spell is cast, the user will explode forcing any creature within 800 feet in a sphere, centred around the user, must roll a dexterity saving throw against your spell save DC. On failure, all creatures in the sphere take 15d20+45 Force damage. All creatures that succeed the save, take half damage the damaged rolled.

Once the caster uses this spell, they die instantly.