Stormcaller
Power! Unlimited, Power! … Ahem. If you want to shoot lighting from your hands, the Stormcaller sub-class is perfect for you. While its grenades may lack some punch, this is made up for by their ability to chain across multiple different targets. Your melee can be upgraded to have an insane amount of reach, allowing you to still engage targets at a distance.
However, the true key to the this Warlock subclass is the Stormtrance super, which gives users the ability to glide across the floor and electrocute a number of different enemies. This can be adjusted to either last longer, chain across multiple targets, or even give you the ability to warp from place to place. If you want to embrace your inner Sith Lord in Destiny, the Stormcaller is the class for you.