Repel Vermin

Player's Handbook v.3.5 (PH)Core (3.5)
School
Abjuration
Casting Time
1 standard action
Components
V, S, DF
Range
10 ft.
Duration
10 minutes/level (D)
Saving Throw
None or Will negates (see text)
Spell Resistance
Yes

An invisible barrier holds back vermin. A vermin with Hit Dice of less than one-third your level cannot penetrate the barrier. A vermin with Hit Dice of one-third your level or more can penetrate the barrier if it succeeds on a Will save. Even so, crossing the barrier deals the vermin 2d6 points of damage, and pressing against the barrier causes pain, which deters most vermin.