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Katana Yodan: The Immortal Masters
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11 August 2026

A young adult urban fantasy in which a teenage student becomes the target of a centuries-old dark lord who wants her power for himself. Book four in a coming-of-age series of chi magic, magical martial arts and a school under siege.
The Enemy Knows Who She Is. The Walls Won't Hold. Her Power Could Become His.
Teenager Katana is being hunted by Jaaku, a withering, centuries-old dark lord who's uncovered her true identity. Her limitless energy could grant him eternal life.
As allied masters declare war on him and his Arashi assassins, Katana is locked inside the Hall of the Dragon for her own safety. But the magical martial arts boarding school is no longer safe, and she must master new powers before its defenses fall.
Perfect for fans of Patricia Briggs, Ilona Andrews and Kelley Armstrong.
Praise for the Katana series:
★★★★★ “This book actually left me breathless!”
Ken Warner grew up reading science fiction and fantasy; his early favorites were The Chronicles of Narnia, Dune, and of course, Lord of the Rings. When he began his martial arts training in high school, he heard many myths and legends about masters who possessed mysterious powers, typically attributed to their internal chi energy. He often thought these legends would make a great story. This ultimately led to his first books, The Katana Series. Ken continues to focus on science fiction and fantasy in his writing. He went full time with his author career late in 2020. Ken lives in Connecticut with his wife, Parveen, and their many dogs and cats.