Eddy's Frost blade

You create a blade made of Pure ice that can be held in 1 hand. While the spell is active and the sword is in your hand, you can spend your action to make a melee spell attack with the sword. On a hit, the target takes 2d4 cold damage, and its speed is reduced by 5 feet until the start of your next turn.

The spell's damage increases by 2d4 when you reach 5th level (4d4), 11th level (6d4), and 17th level (8d4). In addition, at the 6th level, the sword becomes magical for the purpose of overcoming resistance/immunity.