I'm attempting to design a spell. I think I have the base mechanics mostly covered, I just need to determine what level this spell might be to be balanced.
Primary Question: What level should this homebrew spell be, and why? If you can reference other spells or rules from official source books to back up your answer, that would be helpful.
Commentary: The idea is that this spell can get you a weak, less-stable summon. The fact that it is concentration lets the caster break the spell early if things go south (eg. the insects start attacking the caster's allies).
Conjure Insect Swarm
Casting Time: 1 action
Range: 60 feet
Components: V, S
Duration: Concentration, up to 1 hour
You summon a Swarm of Insects. The swarm is unnaturally hostile to all creatures, and has no sense of self-preservation.
The DM takes control of the Swarm of Insects. They roll initiative for the summoned insects, which has its own turns. The DM has the swarm's statistics.
The swarm dissipates and the insects become uninterested when the spell ends.