Discharge

You discharge a portion of the energy used to damage you. Every creature within 60 feet of you must make a Dexterity saving throw or suffer 1d8 points of Thunder damage for every 10 missing points from your Maximum Hit Points.

For every level of spell slot used to cast this spell beyond 3rd, the range increases by 10 feet. If you cast this spell at 5th level or higher, you additionally heal 4d10 + your spellcasting modifier Hit Points.