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I believe this will drop on the 17th, along with the LFG tool. Personally this is how boss fights should be. Dynamic. I still remember how I was wierded out when I first encountered him, because I expected him to move at least through the entire zone (since he has wings and he's in an open area). Suffice to say I was disappointed and never bothered to revisit him. I think this is a step forward, and I want to see more bosses play out like this. More complex mechanics to directly and indirectly combat the boss, and discourage zerging.