Well... there we have it from a blue post. Search is over our HAA is tied to a world boss that hasn't spawned.
Thank you to everyone who searched, thought up ideas, found clever or poor ways to troll, and even those who asked the same question for the 500th time. It's been a slice watching the community come together. I'll update more stuff in this thread if it turns out that our HAA is more than JUST a drop.
The world bosses that haven't spawned yet are Na'zak the Fiend, Shar'thos, The Soultakers, Ana-Mouz, and Humongris.