Tonguetwister
(Abjuration, Alteration)

Range:  10 feet per level
Components:  V, S, M
Duration:  Instantaneous
Casting Time:  5
Area of Effect:  One target
Saving Throw:  Negates

When this spell is cast on an enemy wizard, it will cause the target's tongue to twitch violently, thus disrupting any spell being cast at the moment, unless the victim makes a successful saving throw versus spell. The level of the spell being cast by the target determines the modifier applied to the saving throw as follows: saving throw modifier = spell level - 5 (i.e., a 2nd-level spell inflicts a -3 to the saving throw, a 7th-level spell earns a +2 to the saving throw, etc.).
The victim must be in the process of casting a spell with a verbal component. If no spell is currently being cast by the target, the tonguetwister has no effect. If the opponent's spell goes into effect at the same time as the tonguetwister, the victim earns an additional +2 bonus to the saving throw. This spell cannot affect a spell that has already been cast, nor one that is to be cast in the future.
The material component of this spell is a tongue of any creature; this is consumed when the spell is cast.

