I'm just like you, I got this helm this week from Xur. I leveled it up to get the bonus effect but I still don't really understand what it does. I speced just like you but I can't see the helms effect working. I just don't understand voidwalker and the energy drain effect, I alway play sunsinger and this helm just doesn't seem good enough to make me want to switch.
English
-
I finally figured it out. Basically it passively gives you " the hunger" mod with out actually having it selected on your skill tree so you're allowed to have angry magic or annihilate with the hunger at the same time. But it does not stack with the hunger. Unfortunately.