Book Arkady Saulski. Chronicles of Steel. Book 2. Lady Silence

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Once, the gods gave him a chance at redemption and eternal peace, but he returned alive in the form of a ghost. Now death pursues him, taking others because it couldn't deal with him. The Nagata Clan awaits oblivion. The old daimyo will lead his warriors no more. His sickly young son will likely die before his father. The Snake Clan rages in the province, poisoning all they cross paths with. An army of ronin is led by someone without an understanding of honor and duty, and they'll even have to bow to the Spirit. And near the border, countless hordes of mandukes await the signal to attack. Yes, the days of the Nagata Clan are numbered. But before funeral fires are lit, the old samurai with an iron will will send a warrior after the dying boy, a warrior born of magic. Magic. It all started with it. And it will all end with it.