Lastly, a great way to implement this would be in a branching line of quests. Just like with class specific quests in their respective guilds, these quests would provide an action, and possibly also a trait, upon completion and unlock the following quests while locking alternative quests. These quests wouldn't need to have a particularly detailed storyline, especially since it would branch apart, but I would expect a decent level of difficulty and exploration, although it should involve a decent amount of lower level quests for previously mentioned reasons.

Does anybody have any thoughts or opinions on this?