I didn't manage to get to the battle roulette until later so I ended up going straight to the closing ceremony after as it was about to start. Given that the itinerary said the ceremony ended at 9:30 and my ticket said the event was until 10, I figured I'd have a chance to quickly dash to the quartermaster and see what the little plastic chip they gave us for clearing the challenge was for. Instead afterwards we got rather bluntly ushered out of the venue.
Did I miss out on a prize? Or were they just giving us plastic chips for the he'll of it? Don't get me wrong, that was the most fun I've ever had fighting Gilgamesh, but this little red plastic chip in among my loot is bugging me.