Forbidden. Lucifer and the Dark Goddess, #2

Feirin has lost the one she counted on the most. Lucifer is missing. But despite the loss the dark goddess has a job to do to save the Earth from the god of chaos. When she discovers that her friend and mentor, Maya, is not who she thought she was, trouble ensues. And in the midst of it all she ends up in the dreamworld, going from one disastrous experience to another. Are these lessons or some kind of riddle she's supposed to solve?  The deeper she goes the more confused she becomes, especially since she's being told that the loss of her goddess powers is only temporary.
If it's temporary why have months gone by, months in which she could have done something to keep her people safe from Surt, the god of chaos?  As each lesson unfolds she asks herself--who is the dark goddess? But no one has the answer. She has to discover it herself, but will she manage it in time to save  Earth?