Conjure Vile Swarm

This spell can only be cast if you are illuminated by moonlight. You draw the available moonlight towards yourself and redirect it to the ground. Insects and vermin bursts from the ground glowing a bright teal and quickly growing in size: each is soon the size of a small cat. These enlarged and magically enhanced vermin are called a [Tooltip Not Found]. As a bonus action you can direct the movements of the swarm. If you do not, then the swarm attacks the nearest creature.
This swarm of vile things does not recognize friend or foe and will continue to exist until the spell expires or is dispelled: even if the caster is incapacitated or dead. These creatures are native to the Feywild and will sometimes continue to exist if they are conjured near a portal to the Feywild. If this does happen, then they will flee into the ground after the spell has expired and will ignore any control attempts by the caster.