Torrential Blade

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal damage and effects and then becomes coated in an aqueous torrent until the start of your next turn. The first time the target is hit by another spell or weapon attack before the start of your next turn, the target takes an extra 1d6 cold damage, and the spell ends.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack made as part of the spell's casting deals an extra 1d6 cold damage to the target on a hit, and the damage the target takes when hit by another spell or weapon attack increases to 2d6. Both damage rolls increase by 1d6 at 11th level (2d6 and 3d6) and again at 17th level (3d6 and 4d6).