I have been running a collateral damage Warlock that is all about big bangs and wiping the battlefield. I cannot overstate how much I love the Bloom ability in the Voidwalker subclass, it makes all of the Voidwalker skills 100% better. Typically I use Scatter Grenades with Bloom, which creates a cascade of explosions, and thanks to the Bloom effect any enemies killed this way explode again, easily clearing away swathes of foes. Bloom also makes Axion Bolt shine, as any enemies killed by the seekers explode, causing further damage. As for my super, I use Shatter and Annihilate with my Nova Bomb, this combination, along with Bloom, is superb at clearing away huge groups.

Almost done leveling my Voidwalker Warlock. My goal is to make him a Nova Bomb machine, using upgrades that help boost super regen as much a possible.

Yes.

I have been using a sunsinger warlock with all the defensive and shield abilities. running a pistol and shotgun. Melee warlock build. Its been working very well so far.

Uh by spec do you mean whatever skill is after the one you have now?

I've been running as a burn DoT warlock. Sunsinger with Touch of Flame along with Viking Funeral allows them to apply a DoT that constantly deteriorates the enemy. Added damage from Scorch also is a great way to go. I plan on using the Brimstone Scorch add-on to cause a chain explosion. As for Northwind's build I think he just gave me hope in VoidLock again.