I was reading the mtl and since the tl has caught up. To where I was and passed it I want to jump. Back in but can't remember the chapter. This was after the second shaman mission after he completes it he leaves the dungeon world and fights some other strong mage, I think he was a super nova or something. After he kills that guy he gets an OP weopon from him. But it has some curses and downsides to using it and after that he goes into another dungeon world to. Get stronger, I think that world was about a trail of something, he starts off in a boat Yea that's where I am
Okay, so the guy was Bannen one of the 13 supernova, the cursed weapon was Fallen Cross and was the reason why Bannen was so annoying to beat but didn't have much loot. Second of all, that is a huge amount of chapters to rifle through. Just check your history on mtl and match chapter numbers.