The Last Skinweaver - The Book of Ruin Series, #4

To escape his father's despotic claw, Roge Callan changes his name to serve as a sergeant under a banished RangerKnight. They live among former enemies, the Skinweavers, who seek help to find a path out of their barbaric tribal past. But the benevolent Widow Witches and their sentient Yetis have gone missing, and only someone with Widow Witch blood can find and rescue them. Unbeknownst to Roge, he has the blood and is the League of American Castles' only option.
In a hobbled and sabotaged swiftship called the Drunken Stork, Roge pulls together a small crew of misfits and travels from Mitteleuropa to Russia to the Middle Kingdom. They confront along the way ambushers, pestilence, vicious chimeric predators and titanic storms. However, Roge is not the only one with problems. Thousands of dead Han soldiers keep disappearing after battling brutal steppe invaders.
Plus, alien-looking outlanders are stalking the Middle Kingdom in powerful skyships no one can match. All the while, court intrigue, well-guarded secrets and backstabbing keep Luminous Emperor Zhong Ren from learning the meaning of his diviner's mysterious predictions. THE BOOK OF RUIN SERIESBOOK 1: The Book of Ruin (Winner of the 2020 Indie Reader Discovery Book Award for Science Fiction)BOOK 2: The Flashfall Sword (Recommended by Indie Reader and Readers' Favorite)BOOK 3: RangerKnightsBOOK 4: The Last SkinweaverBOOK 5: In the Time of the Flash