Thunderclap

To cast this spell, the druid takes an oak leaf in hand and slaps that hand against any hard object (including the other hand). The result is a sound very much like a thunderclap that can be heard for miles. Any creature within 30 feet of the druid is stunned and deafened unless a successful saving throw vs. spell is made; in which case the creature is only temporarily deafened for 1d10 rounds. A stunned creature cannot initiate or continue any action for the remainder of the current round or the next round. Attacks made while deafened are at a penalty of-2. Deafened creatures have a -3 penalty when rolling for surprise. The caster is immune to the spell's effects.

The material component is an oak leaf.