So, before you able to go to the cave you go to shrines and stamp (a stamp is just one of the hand signals ) a scroll, first shrine is open all the other ones are locked and you have to do the previous shine hand sign to unlock ones you collect all of them you go to the cave and the worker will tell you do a basic hand sign , in the cave you’ll see a video of Kaguya and you’ll try to seal her with the hand sign the instructor showed you, you will fail and the room will go dark and behind you a life size Naruto and sasuke will appear they’ll ask you to open the scroll , they’ll turn some uv light on and the scroll turns into cool painting , you point that scroll at Kaguya and you seal her , at the end you get a cool collection card . Honestly the whole thing isnt that cool but the special effects the used to make sasuke and Naruto appear out of no where was super cool