Your allies need not fear friendly fire.
Prerequisites: Spellcraft 5 ranks or 1 metamagic feat
Benefit: When casting a selective spell with an area effect and a duration of instantaneous, you can choose a number of targets in the area equal to your casting ability score modifier. These targets are excluded from the effects of your spell.
Using this feat increases the magic point cost of the spell by 2. This spell’s total cost cannot exceed your caster level.
Spells that do not have an area of effect or a duration of instantaneous do not benefit from this feat.