From Pathfinder Rage of Elements, which isn't enabled.

Conductive Weapon

SPELL 1

CONCENTRATE ELECTRICITY MANIPULATE METAL

Traditions arcane, primal

Cast

Range touch

Targets 1 metal weapon that is unattended or is wielded by you or a willing ally

Duration 1 minute

You channel powerful electric current through the metal of a weapon, zapping anyone the item hits. The target becomes a +1 shock weapon. If any target of an attack with the weapon is wearing metal armor or is primarily made of metal, the electricity damage die from the shock rune is 1d12.

Spell Effect: Conductive Weapon

Pathfinder Rage of ElementsOGL