Dark Flare

A stream of dark fires bursts forth from your hands in a 40-foot long, 15 foot wide line. Any creature in that line must make a Dexterity saving throw or suffer 5d4 points of Necrotic damage and 5d4 points of Fire damage and become blinded for 1 minute, or half as much on a success and are not blinded.

For every spell slot level used to cast this spell beyond 3rd, the damage increases by 1d4 for both damage types and the line becomes 10 feet longer.