If you managed to defeat all 6 diciples of Iwakura Art, you will get "Iwakura Out" achievement

You will also get 1 hidden luxurious chest

Here's how you can complete this hidden Wonders of the World Achievement

Location 1, Byakko Plain

Sky's Note:

|| I've completed this achievement before, but it's easy to spot them

|| where they spawn (the Nobushi Samurai), you can see a precious chest near them too.

|| If you haven't claimed the chest yet, there's high chance you haven't defeat them

Location 2, Byakko Plain

|| Each spots will give same pattern: sealed chest, there's nobushi samurai there, and they're near a camp

Location 3, Serpent's Head

|| You're halfway there! 3 more to go~

Location 4, Serpent's Head

|| You will meet the nobushi at the end of the broken bridge

Location 5, Araumi

|| If you haven't unlocked this waypoint yet, you need to complete "cleansing defilement" world quest first

Location 6, Kujou Encampment

|| In here, you will find 1 mini "big boss" moment

|| There's no chest, there's no camp, but only 1 big tall bOi

|| *You'll trigger a fight once you talked to this big bOi

|| After this, go back to the 1st spot in Byakko Plain

Final Location, Byakko Plain

|| In here, you will see 2 Nobushi as your final big boss

|| Defeat them, and you will earn the "Iwakura Out" achievement

|| Don't forget to place the sword in front of all the swords there to get luxurious chest

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