I've been trying I can see it but won't let me use it

Anything I can't find in stores or chest or crafting (I'm not in clan)

Where can I obtain lvl 200 to 300 for fighter

I moved to map 3-1 or at least it should have been somehow I have wound up in a dungeon it's just one room with a stream and a couple of trees and one character that I cannot talk to and now I'm stuck there I cannot go back out the same entrance there was only one box there with an item and that was...