Conjure Swarm

You summon a 1/2 CR or two 1/4 CR swarms of your choice in an unoccupied space within range. The summoned creatures are friendly to you and your companions. Roll initiative for the summoned swarm, which has its own turn. They obey any verbal commands that you issue to them (no action required by you). If you don't issue any commands to them, they defend themselves from hostile creatures, but otherwise take no actions. The area encompassed by the swarm size determines the Area of Effect.

The GM has the creatures' statistics. Sample creatures can be found below.

At Higher Levels. When you cast this spell at higher levels, the CR of the swarm increases by one level, so at lvl 2, a CR 1 or two CR 1/2 can be summoned, at lvl 3 creatures at or adding up to CR 2 can be summoned, for instance 4 CR 1/2 or 2 CR 1 creatures. 

Sample Creatures