It's a challenge quest, accessible from the Gathering Hub. Quest is called 'Down the Dark, Muddy Path' and you need to hunt a huge Barroth (guaranteed large gold crown if you didn't have it yet). You'll need 7 tickets for the entire set, so be prepared to hunt it multiple times. Also, since it's an Arena quest, the Barroth is scaled for two players, even if you solo it.Ok, I still haven't figured out how to get the Ryu armor from the Spring event. What do I need to do?