Chromatic Strike

Your weapon shines in scintillating colors as you make your attack before it bursts into a blinding spectrum of light. As part of the action used to cast this spell, choose acid, cold, fire, lightning, poison, or thunder then you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, the target then takes an extra 2d8 damage of the chosen type and is blinded until the end of its next turn.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage  increases by 1d8 for each slot level above 2nd.