Will-o'-Wisps

You create three tiny golden motes of light which flit about you and blink oddly. Each mote hits a creature of your choice on a successful ranged attack with advantage. A mote deals 1d4 lightning damage to its target. The darts all strike simultaneously, and you can direct them to hit one creature or several. If a creature reaches 0 hit points as a result of this spell, the caster gains its remaining HP as temporary hit points.

At Higher Spell Slot: When you cast this spell using a spell slot of 2nd level or higher, the spell creates two more mote of light for each slot level above 1st. 

At Higher Caster Levels: At 5th, 11th, and 17th level, damage is increased to D6, D8, and D10