Devil's Icy Veins

You freeze the blood and veins of a creature you can see within range, at the cost of your own mobility. Make a ranged spell attack against the target. On a hit, the target takes 6d6 cold damage as must make a constitution saving throw as its veins and blood freeze solid. On a failure, it is paralyzed until the end of your next turn as its body seizes up. Wherever your chill magic touches the target's skin, it blackens and shrivels.

After casting the spell, the intense cold emanating from your hands causes them to stiffen and freeze. You cannot take bonus actions until the end of your next turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d6 for each slot level above 3rd.