Shock Weapon (enhancement)

Source

4-core enhancement

weapon (simple or martial melee)

This weapon faintly glows with a pale-green color, and while charged white runes light its surface. The air around it is filled with static electricity.
     This weapon has 4 charges. Every attack with it expends one of the remaining charges, regardless of whether or not the attack hits or misses. When the wielder hits a creature with this weapon while expending a charge, it deals an extra 1d4 lightning damage.
     A creature which takes any of this lightning damage unreduced must make a single DC 13 Constitution saving throw at the end of the current turn. On a failure, the creature is paralyzed until the end of the wielder's next turn. If the wielder takes damage, it can repeat this saving throw, ending the condition on a success.
     After no attack has been made with this weapon for 1 minute, it fully regains its charges.