Thriss' Mini Magic Missiles

You create 1d8 glowing darts of magical force. Each dart hits a creature of your choice that you can see within range. A dart deals 1 force damage to its target. The darts all strike simultaneously, and you can direct them to hit one creature or several. If you roll a 1 for damage the spell fails and the caster takes 1d6 psychic damage.

The number of darts is increased by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).