Weighted Strike

You infuse your weapon with your arcane inventions with more mass and weight behind them, delivering more power behind your strikes. The next time you hit with a weapon attack before the spell ends, the weapon gleams as if entirely metal, and the attack deals an extra 2d8 force damage. Additionally when hit, the target must make a Strength saving throw against your spell save DC, on a fail their movement speed is halved while you concentrate on the spell as the weight of the strike sends ripples of energy through their body, making it harder for them to move.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the extra damage increases by 1d8 for each slot level above 3rd.