Backblast

Injecting this Tonic allows you to utilize excess energy that is typically wasted when spellcasting. Whenever you cast a spell of 1st level or higher, you vent excess magic in a close-range burst around you. Any creature of your choice within 5ft of you must make a Strength Saving Throw equal to your Spell Save DC. If they fail they take Force damage equal to your Proficiency modifier + the level of the spell slot used, and are knocked back 5ft. If they succeed they take half damage and are not knocked back.