Swirl of Crows

When cast, choose up to 7 medium or smaller sized creatures that are unaffected by this spell. A swarm of crows will surround the caster and follow them around for up to 5 minutes, and any person that isn't unaffected by this spell that enters this its radius must take 3d8 necrotic damage. After one person takes damage from this spell, it ends.

At higher levels: Starting at 3rd level, increase the number of times a creature can enter the radius and take damage by 1 for each extra level slot expended. If a creature enters the radius and takes damage, and the spell hasn't ended because it was cast at a higher level, it takes damage again if it starts its turn inside the radius.