Cero

Originally developed by an ancient lich, this spell draws on necromantic secrets to sap life force in a harrowing blast. Steeling your resolve, you fire a line of black-tinged red energy 60 feet in a direction. Each creature in line must make a Constitution save, taking 3d8+spellcasting ability modifier Necrotic  damage on fail, and being Frightened for one round on a success. By drawing on your own life-force, you can expend one hit die on cast to increase the damage by 1d8. Hit die expended for this spell are regained as normal.