So, I was doing quests with my main character, then when I reached Starry Town I reached class level 45, with a character level 410. Mind you that I still have a lot of quests remaining to do, like Maven waters, Outer Wall, Pastis Forest and more. So I thought it would be a waste completing these quests now and losing all the xp rewards.
So getting to the point: Do you guys think that someday we will ever have a 4th advancement (or 5th class) in Re:Build?