Now I was looking for a spear that I would enjoy using, and I was thinking why not have a spear weapon that had a secondary similar to the "Dragon head pistol". A secondary that when clicked would fire a small bolt of energy based on the elemental type, but when charged would fire a bigger shot that did more damage and consumed more energy.
..So a harpoon gun. I feel like it'd be a rocket launcher without the explosive radius. It'd better hit damn hard for the ROF.