Why does the novel use third-person narration for its Prologue and Epilogue? How does this omniscient voice differ from Alina’s narrative voice?

How is Alina’s problematic relationship with the Darkling essential to her growth? What does he teach her? What, if anything, does she teach him?

Consider the novel’s treatment of friendship. Are there true friends in this world, or just allies, loyal underlings, and romantic prospects? Why or why not?