The Witch of Wol Sin Lake

The second book in The Sacred Bone series. When the Netherking steals the all-powerful pearl of Seolla, all of Mirae's careful plans are destroyed. She must set out once more to stop him, slipping in and out of the future with her divine powers as she races a path to the heavens itself. When she discovers the truth about the Netherking's intentions and learns that the only way to destroy him is with a sacrifice larger than she can bear, Mirae begins to doubt her free will and even the fate of the entire peninsula and the gods beyond.