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In a world at war with demons, one girl will face the ultimate test when she is forced to enter into an ancient, deadly competition for the chance to save her mother's soul... before she loses her forever.

Nine years ago, the war between the Kingdom of Night and the Kingdom of Rivers tore Àn'ying's family apart, leaving her mother barely alive and a baby sister to fend for. Now the mortal realm is falling into eternal night, and mó - beautiful, ravenous demons - roam the land, feasting on the flesh of humans and drinking their souls.

Àn'ying is no longer a helpless child, though. Armed with her crescent blades and trained in the ancient art of practitioning, she has decided to enter the Immortality Trials, which are open to any mortal who can survive the journey to the immortal realm. Those who complete the Trials are granted a pill of eternal life - the one thing Àn'ying knows can heal her dying mother. But to attain the prize, she must survive the competition.

Death is common in the Trials. Yet oddly, Àn'ying finds that someone is helping her stay alive. A rival contestant. Powerful and handsome, Yù'chén is as secretive about his past as he is about his motives for protecting Àn'ying.

The longer she survives the Trials, the clearer it becomes that all is not right in the immortal realm. To save her mother and herself, Àn'ying will need to figure out whether she can truly trust the stranger she's falling for or if he's the most dangerous player of all... for herself and for all the realms.

The mó - beautiful, ravenous demons who drink the souls of mortals - roam free and they will not cease until all the realms fall to darkness. Àn'ying must risk everything to stop them.

But a betrayal has turned the tides of this war: her handsome rival from the Immortality Trials and the man she was falling in love with, Yù'chén, is now the enemy. Yù'chén is half mó - his mother is the Demon Queen of the Kingdom of Night, and the monster responsible for killing Àn'ying's father.

Àn'ying's one hope is the boy in the jade - her lifelong guardian and heir to the last mortal Emperor - Hào'yáng. Together, they must join forces to rally an army that stretches across realms, from the Four Seas of the Dragons to the Phoenixes of the Golden Desert.

But first Àn'ying must awaken the immortal power slumbering in her own veins...