You rack opponents with eldritch power coursing from your magic weapons.

Prerequisite(s): Use Magic Device 2 ranks, base Fortitude saving throw bonus +3.

Benefit(s): As a swift action while wielding a magic weapon with a weapon special ability that deals extra acid, cold, fire, electricity, or sonic damage on a hit, you deal an additional 1d4 points of damage of the same type with each hit you make with that weapon for 1 round.