Vylja's Thunderclap
(Evocation)(Weather)

Range:  10 yards per level
Components:  V, S, M
Duration:  Instantaneous
Casting Time:  5
Area of Effect:  20-foot radius sphere
Saving Throw:  Negates

After the casting of this spell a strong thunderclap occurs in the area of effect. It automatically deafens all creatures in the target area for two rounds. Moreover, all creatures subject to the thunderclap have to roll a successful saving throw versus spell in order to remain standing. Creatures that fail their saving throw are knocked over by the force of the movement of air and may be stunned for up to one round if the surface they hit is hard (stone or metal, for example).
Deafened creatures suffer a -1 penalty on surprise, a +1 penalty on initiative, and any spells they cast requiring a verbal component has a 20% chance of going awry. If the creature is stunned, it cannot even defend itself, let alone cast spells.
Large creatures get a +3 on their saving throw, small creatures suffer a penalty of -3, and tiny creatures have to save at -6. Huge or gargantuan creatures are immune to the spell's effects. Note that the caster is not in any way protected against the spell's effects.
The spell can be used to scare or confuse a group of creatures and to disperse swarms of flying insects. Used defensively, Thunderclap can deafen the party on purpose so as to avoid the adverse effects of Harpy songs and the like.
The priest needs a small inflated balloon which he has to destroy at the end of the casting by clapping his hands.

