Corrupted Quiver

You create 15 arrows of magical force, each arrow has black dust flowing out of it. Each arrow hits a creature of your choice that you can see within range. An arrow deals 1d4 force damage and 1d4 necrotic damage to its target.  The target(s) takes 2 poison damage per turn for three turns.  The arrows all strike simultaneously, and you can direct them to hit one creature or several.

The activation words are:

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the spell creates two more arrows for each slot level above 4th.