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For thousands of years, there has been a cycle: a Demon King rises and conquers, and a Hero is reborn a hundred years later to defeat him. Each time, civilizations are ground to dust beneath the Demon King's hordes, but humanity has remained secure in the belief that a Hero of legend will always save them. There's just one slight problem. It's only been 23 years since the Demon King's latest rise, and this time, he's already conquered more than half the world. If humanity simply waits for the Hero's return, there may be no world left for him to save.

After the Tortoise Spire climb claims three members of Team Guiding Star Legacy, surviving combat experts Nieve and Hane—teammates by chance if not by choice—cope with their losses by joining another delving group to ascend Tiger Spire. Allied with bickering siblings Rose and Mason, an Architect and a Transmuter, and the Biomancer Lief, they’re led by Odette, an Analyst, who has meticulously studied the spire’s scenarios to locate the mythical Vault of Shadows and claim its priceless treasures.

Benedict Sorellin-Lancaster hasn't even broken in his lieutenant's insignia when he's summoned to meet with the Spirearch of Spire Albion himself for a very special—and very secret—purpose. The Spirearch needs Benedict to retrieve a bag he's "misplaced" on the Colony Spire known as Dependence, which has strangely cut off all contact with the outside world. It's a delicate mission at best, a potential bloodbath at worst. To this end, the Spirearch has supplied Benedict with backup in the form of three Warriorborn.

Seventeen-year-old Jade is recently engaged to a handsome soldier and about to choose her own career. But she didn't expect to witness a murder. When her fiance kills a naiad, plunging the underwater city of Thessalonike into uproar, tensions surge between the mer and the naiads. Jade learns too late that the choices she makes ripple further than she'd ever imagined. And as she fights against the tide of anger in a city that lives for scandal, she discovers danger lurking in every canal, imperiling her family and shattering the ocean's fragile peace.

Five years ago Corin Cadence's brother entered the Serpent Spire - a colossal tower with ever-shifting rooms, traps, and monsters. Those who survive the spire's trials return home with an attunement: a mark granting the bearer magical powers. According to legend, those few who reach the top of the tower will be granted a boon by the spire's goddess. He never returned. Now it's Corin's turn. He's headed to the top floor, on a mission to meet the goddess.

Daniel Lyoncourt, 21, has trained his entire life to join the Brotherhood of the Guardians, who protect Talents, the mortal descendants of the original nine Muses. Daniel is prepared to risk his life in order to keep his Talent safe, but when he's assigned to 19-year-old Anna Saint-James, he discovers that his life isn't the only thing he could lose. Anna has no idea how special she is and knows nothing about her abilities. He must teach her to control her gifts, keep her safe, and hope that he can find a place in her life as something more than just her bodyguard.