Plague of Rats

Dragonlance Campaign Setting (DCS)Dragonlance (3.5)
School
Conjuration (Summoning)
Casting Time
1 round
Components
V, S, DF
Range
Long (400 ft. + 40 ft./level)
Duration
1 minute/level
Saving Throw
None
Spell Resistance
Yes (see text)

You summon twelve swarms of rats, each of which attacks any creature occupying its space. You choose the squares each swarm occupies, but the swarms must all be contiguous. The swarms are stationary after being summond, and won’t pursue creatures that flee.

The Monster Manual has statistics for the rat swarm.