Winter Blade

As part of casting the spell, make a melee weapon attack. The target suffers the normal effects of the attack, and in addition takes cold damage equal to your spellcasting modifier and loses 10 ft. of movement until the end of their next turn.

At 5th level, the cold damage increases to 1d6 + your spellcasting modifier. At 11th level, this damage die increases to 2d6, and at 17th level it increases to 3d6