You require 90 naryu coins to craft a 10 bundle of transformation stone crystals, but getting that amount of coins is tedious and anoying, naryu silver shows a 1=20 value for it, your able to turn 20 naryu coins in to naryu silver but no way to do it vice versa and do it 1 silver to 20 reguler naryu coins, theres alsobthe thing with tablets being currently useslss as far as i know of