Channel Positive Energy — Damage Undead

Channeling positive energy causes a burst that damages all undead creatures in a 30-foot radius centered on the sorcerer. The amount of damage inflicted is equal to 3d6 points of damage at 9th level plus 1d6 points of damage for every two sorcerer levels beyond 9th (4d6 at 11th, 5d6 at 13th, and so on). Creatures that take damage from channeled energy receive a Will save to halve the damage. The DC of this save is equal to 10 + 1/2 the sorcerer's level + the sorcerer's Wisdom modifier.