You can increase the area of your incantations.
Benefit: You can alter a burst, emanation, line, or spread-shaped incantation to increase its area. (Incantations that do not have an area of one of these four sorts are not affected by this feat.) Any numeric measurements of the incantation’s area double.
Using this feat increases the channeling DC of the incantation by 4. The incantation’s DC cannot exceed your maximum DC.