SRD:Shock

Shock: Upon command, a shock weapon is sheathed in crackling electricity. The electricity does not harm the wielder. The effect remains until another command is given. A shock weapon deals an extra 1d6 points of electricity damage on a successful hit. Bows, crossbows, and slings so crafted bestow the electricity energy upon their ammunition.

Moderate evocation; CL 8th; Craft Magical Arms and Armor, call lightning or lightning bolt; Price +1 bonus.