Essence Surge

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Designed to harness the unfettered core of magic, to use essence is a high-risk, high-reward gambit. Tampering with raw magic is exceptionally dangerous, yet undeniably potent.   You channel essence to unleash a devastating surge of energy toward a creature within range. The targeted creature takes 3d8 force damage that cannot be resisted.   You may choose to amplify the spell's power by spending one of your hit dice, thereby adding an additional 1d8 damage. However, if you do, you must make a Constitution saving throw (DC equal to 10 or half the damage dealt, whichever is higher). On a failed save, you suffer one level of exhaustion.   At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the base damage increases by 1d8 for each slot level above 3rd. Additionally, you can choose to spend an extra hit die for each level above 3rd, with the same risk of exhaustion as detailed above.