Ulric's Force Shard

You weave together threads of pure force energy to create a magical projectile that endlessly replaces itself. The projectile is spectral and floats around you for the duration. When you cast the spell for the first time and as a bonus action on your subsequent turns, you are able to make an attack with the spectral projectile to a target you can see within range. Make a ranged attack against the target. On a hit, the target takes 2d8 + your Spellcasting modifier force damage. If you score a critical hit with this projectile, the creature must succeed on a Constitution saving throw or on a failed save the creature loses its footing (balance) and the next attack roll versus it has advantage on it, Until the beginning of your next turn.