City Magic

 
Prerequisite(s): Spellcaster 3rd level or greater
 
Benefit: You can modify any damaging spell you cast to incorporate the urban environment. When casting an offensive spell with an energy subtype, you can invest the spell with a portion of the city's spirit. In most cases this investment is gritty and spectacular, drawing dirt, gravel, nails and other nearby debris into the spell effect. In other cases, the effect is much more subtle, often merely changing the look of the spell. Only half the damage from the spell is considered energy damage. The remainder of the damage comes from the city itself and therefore bypasses energy resistances and immunities. This feat only works on spells that are cast within urban areas of at least a small town in size. A spell modified by this feat uses a slot of the spell's normal level.
 
Source: Cityscape