The character emits an ear-splitting yell that deafens and damages creatures in its path. Any creature within the area is deafened for 2d6 rounds and takes 2d6 points of 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 damage per caster level (maximum 15d6). Crystalline creatures are allowed Fortitude saves to reduce the damage by half, and creatures holding fragile objects can negate damage to them with successful Reflex saves.
A deaf character, in addition to the obvious effects, suffers a –4 penalty on initiative and a 20% chance to miscast and lose any spell with a verbal (V) component that he tries to cast.
The shout spell cannot penetrate the spell silence.