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

Jolt Coil

ITEM 3
ELECTRICITYMAGICALSPELLHEART
Price 60 gp
Usage affixed to armor or a weapon
Bulk —

Contained within this small glass tube is a twisted wire filament crackling with electricity, sending static prickling through the hair of anyone holding it. The spell DC of any spell cast by activating this item is 17.

  • Armor You gain resistance 2 to electricity.

  • Weapon After you cast an electricity spell by activating the coil, your Strikes with the weapon deal an additional 1d4 electricity damage until the end of your next turn.

Effect: Jolt Coil - Armor

Effect: Jolt Coil - Weapon

DC 17 basic Reflex

Activate Cast a Spell
Effect You cast Electric Arc.
Pathfinder Treasure Vault (Remastered)ORC