EQG4 is a giant allegory for puberty
First, the movie takes place at a summer camp, which is obviously a classic backdrop for coming of age stories
Our hero Twilight is struggling with a "darkness" coming up from inside her that she doesn't understand and can't fight.
Que the song "Midnight in me" in which twilight sings the lyrics "I didn't know what I didn't know". That's obvious enough, i won't even explain that one.
Soon, her friends are also experiencing the effects of this darkness and no one knows how to handle it.
Que the song Embrace the magic in which sunset convinces the group that this new change isn't something to be afraid of
Then you have Filthy Rich and Gloriosa. Filthy Rich represents all the unfairness of the world, and Gloriosa represents the anger that young teenagers have toward it, and their desire to lash out against it.
The final showdown is literally a showdown between handling your problems with a level head versus handling them with violence and anger, with the final moral being to not fall into the pitfalls of teen angst and despair.
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