Energy Storm (Su): A 7th-level elemental master can surround itself with a vortex of swirling energy corresponding to the dragon's attuned energy type. The vortex extends from the dragon in an emanation with a radius of 5 feet per class level. The effect stops attacks with thrown weapons and projectiles. Such attacks fail if made by creatures inside the area, or if targeted at creatures within the area, or if their paths take them through the area. The storm deals 2 points of damage per class level to every unprotected creature within its area each round. The storm lasts for 1 round per class level (though the dragon can dismiss it as a move action), and counts as two uses of the dragon's breath weapon. The dragon cannot use its breath weapon (or its energy burst ability) while the storm is in place and for 2d4 rounds after it subsides.