Call of the Night

Your choice of a swarm of bats, insects, rats, ravens, or spiders appears in an unoccupied space within range for the duration. 

The swarm is an ally to you and your companions. In combat, the swarm shares your initiative count, but it takes its turn immediately after yours. It obeys your verbal commands (no action required by you). If you don’t issue any, it takes the Dodge action and uses its move to avoid danger.

At Higher Levels. For each slot above 1st used to cast this spell, the swarm starts with an additional 10 temporary hit points when summoned.