I'm not sure I understand why these bosses exist.
They don't really drop anything except a really low chance at a low quality epic. I know there's an achievment for killing all of them, and a weekly quest for a little gold and VP, but is that really their only purpose? The rewards just seem very meager, and barely even worth it.
I just don't see any real motivation to summon them, and I'm having a hard time understanding what the point of them is. What was Blizzard's intent?
They're a somewhat major feature of the Isle of Thunder, but they don't really do anything...