Arcane Stockpile

You channel your arcane power to store energy within your weapon.

On a melee attack hit you store Power. Every stack of Power stores one dart of magic missile with each dart dealing 1d4 +1 force damage. You can choose to unleash your Power with a bonus action, thus breaking your concentration, and firing all your darts at any number of targets.

If the spell ends before you unleash its Power nothing happens.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the spell creates one initial and then one more dart for each slot above 2nd.