Shout

Source shout

The duration that creatures in the area are deafened increases to 4d6 rounds, and the damage dealt increases to 5d8 points of sonic damage. The damage dealt to crystalline creatures and exposed brittle or crystalline objects increases to 1d8 points of sonic damage per caster level (maximum 15d8). Crystalline creatures reverberate with sonic energy, taking 4 points of sonic damage on your turn for a number of rounds equal to your tier.