Trident of the Storm

You create a trident made of lightning in your hand and can be thrown at anyone or any thing. To attack role a d20 and add your Strength modifier, then role 3d6 of lightning damage. Anybody within a 10 feet radius of the target must make dexterity saving throws (the one you are attacking does not), if anything lower then a 16 is rolled they take half damage. 

Add 1d6 more at if it is raining and and if storming add 2d6.