Arcane Discharge

You build up and release an intense burst of arcane might in an explosion around you.

Each creature within 30 ft. of you when you cast this spell must make a Constitution saving throw, taking 10d12 force damage on a failure, or half as much damage on a success. You can choose to expend additional spell slots to fuel the explosion - you can choose to expend a number of spell slots of a level lower than this spell equal to your spellcasting ability modifier. For each level of spell slot you expend in this way, you deal an additional 1d12 force damage.

When this spell ends, you gain four levels of Exhaustion.