I'm playing Ni No Kuni and I finished the Miasma Marshes, entered Nevermore, defeated Shadar and now I'm almost at the end of the game (doing the Ash Clouds "missions"). My travel through Nevermore was very fast and I missed lots of its treasures, as I was only exploring, but I defeated Shadar and I decided to continue the game.
My question is: Is there a problem with skipping the chests in Nevermore? Are there any important treasures that I won't find anyplace else (i.e. that I would only find in Nervermore)? Will this compromise any trophy achievement? I have a save before entering Nervermore, so if those chests are important I can go back and redo these parts, but if there is no problem, I will continue the game.