Deep Magic Volume 2 (p.156)
Conjure Rats
1-level Conjuration
Casting Time: 1 action
Range/Area: 60ft.
Components: Verbal, Somatic
Duration: Concentration, 1 hour
Damage/Effect: Summon
You summon rats or ratfolk that appear in unoccupied spaces that you can see within range. Choose one of the following options for what appears:
Each rat disappears when it drops to 0 hit points or when the spell ends. The summoned rats are friendly to you and your companions. Roll initiative for the summoned rats as a group, which has its own turns. They obey any verbal commands that you issue to them (no action required by you), except the wererat. If you don’t issue any commands, they defend themselves from hostile creatures but otherwise take no actions. The GM has the creatures’ statistics.
At higher levels: When you cast this spell using higher-level spell slots, you can choose one of the summoning options above, and more creatures appear: one additional creature with a 2nd-level slot or three additional creatures with a 4th-level slot. Any summoned wererats obey verbal commands.
Available for: Cleric, Druid