By the time we get to Chapter 5 in The Fourth Queen, all of the main characters have been introduced, as well as the land of Empryean.
Zandria and Olena have started their journey with Adam on their trail. Werewolves are searching the jungle. The bad guys are preparing their army. Even Fury is on his quest.
This is where Joseph Campbell's Hero's Journey comes into play. Zandria has to go through her trials, because she is the hero here. All of the stages are in the plot and I will point them out as we continue.
The first stage is The Ordinary World. Kind of like a prologue where the hero is introduced. The hero is lacking something or has a tragic flaw. We also establish what's at stake.
From there, the hero begins the journey and hopefully a transition from the ordinary life to the special one.
One important piece of storytelling for me is the Character Arc. Following the hero's journey naturally provides for this arc. The character must change (who wants to see Harry Potter living under the stairs at age 30?). It doesn't always have to be the main character, but no story is complete with out someone undergoing some change.
Next comes The Call to Adventure...