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From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Polarizing Mace

ITEM 10
Price 950 gp
Usage held in 1 hand
Bulk L
Category simple
Group club
Damage 1d4 bludgeoning

Even grasping the amber handle of this +1 striking shock light mace makes your hair stand on end.

Activate (concentrate, manipulate)
Frequency once per day
Requirements The wielder of a grounding spike is within 30 feet

Effect A great surge of electricity connects your paired weapons. All creatures in a line between you and the wielder of the grounding spike take 4d12 electricity (DC 24 basic Reflex).
Special The polarizing mace pairs with the Grounding Spike.
Pathfinder Treasure Vault (Remastered)ORC