While it may be a PVP god, sunsinger imo is the most mind numbingly boring warlock class to play hands down.
I'm trying now to give it another shot, but I'm so tempted to go running back to voidwalker.
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Sunsinger, hands down. It's neutral game when I use the perks I like is boring. It's just a grenade, a melee that grants an overshield, and angel of light. It's super just lets me use the same things, but more often, and for only 13-ish seconds. Since titans have Empyrean Bellicose now, I pretty much lost the only reason that I like the subclass.