You emit an ear-splitting yell that deafens and damages creatures in its path. Any Creature within the area is deafened for 2d6 rounds and takes 10d6 points of sonic Damage. A successful save negates the deafness and reduces the Damage by half. Any exposed brittle or crystalline object or crystalline Creature takes 1d6 points of sonic Damage per Caster Level (maximum 20d6). A Creature in the area of the cone can negate the stunning and halve both the Damage and the Duration of the deafness with a successful Fortitude save. A Creature holding vulnerable objects can attempt a Reflex save to negate the Damage to those objects. A greater shout spell cannot penetrate a silence spell.