Storm Hammer

Sparks of crackling electricity arc from this +1 magic warhammer, and the head thrums with distant thunder. Any hit with this hammer deals 1 extra electricity damage. You can use a special action to transform the sparks into lightning bolts.

Until the end of your turn, the hammer deals 1d6 extra electricity damage instead of just 1. After you activate the storm hammer, you can't activate it again for 10 minutes.