Twilit Decay

You channel the entropy of the void, sending a ray of withering darkness toward a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d6 necrotic damage, and it has disadvantage on the next attack roll it makes before the end of its next turn as shadows cling to it, obscuring its vision.

The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).