Guild Wars 2 makes a great example of an epic encounter public event boss. Dozens of players are gathered around to defeat this monster. I only wish things like this could be implemented in destiny's patrol areas. Just imagine a patrol full of guardians trying to take down an epic public event boss.
https://www.youtube.com/watch?v=ThK1KvSsbOw
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I enjoy the publics, would love to see them expanded on on some way.