Vermintide

You conjure a vast swarm of rats in any location you see within range. The swarm dies when it drops to 0 hit points. The swarm's friendly to you and your allies. Roll initiative for the swarm, which has its own turns. It obeys any verbal commands you issue (no action required). If you don't issue any commands, the swarm will spend its turn looking for the nearest food source. If the swarm's alive after 8 hours, you'll lose control, and the swarm will disband into many small rats. You can recast the spell before it expires to regain control.