Total Annihilation

Calling upon powerful dark magic, the spell caster then crushes the components in their hand, and unleashes a cone of pure arcane energy to obliterate everything in its wake. All creatures in a 120ft cone from the spell caster, in a direction of the caster's choice, must make a DEX. saving throw, or take 15d10+60 force damage. This damage cannot be reduced by any means, and ignores resistances, and immunities. If a creature passes the saving throw, they take no damage. This spell destroys everything in the affected area, including magic.The affected area becomes a Dead Magic Zone for 1d12 days after casting this spell. Any preexisting magic in the affected area is destroyed. For example, the spell Forcecage, if caught in the area of this spell, would be destroyed. This spell also causes the caster a great stress. The caster must make a CON. saving throw against their own spell save DC. On a failure, the caster takes half of the damage dealt, falls unconscious, and cannot use any magic for as long as the Dead Magic Zone exists. On a success, the caster's movement is halves for 1d12 rounds, the caster cannot cast spells for as long as their movement is halved, and is vulnerable to damage from spells.