I was riding out to Coerthas today and not far from Camp Emerald Moss came across this mysterious man who issued me a challenge. It was a straightforward request, kill as many imperials as possible. I did so and was not the only one, many other adventurers stood by my side.

After all the imperials fell I was left wondering. Where did this event come from? I've seen nothing about it in any patch notes and the npc was gone as soon as I collected my reward. The enemies were of the same level as the camp so I assume that these npcs are popping all over Eorzea. Any one else spotted these mystery npcs or know when this started?