Your spells can affect more targets.
Benefit: A spell that normally affects a single target now affects 1 target /caster level, no two of which can be more than 30 ft. apart. A mass effect spell uses up a spell slot 4 levels higher than the spell’s actual level.
Special: If used with a touch spell, all targets must be in physical contact with one another. This feat does not work on spells with a range of “personal.”
Section 15: Copyright Notice – Advanced Feats: The Witch’s Brew