Kojiro

A sword & sorcery fantasy novel based on Asian myths & legends.
Tulpas, otherwise known as thought-forms, spring first from the imagination, then go on to live lives independent of their creators. And sometimes, they maintain a hostile, even violent, relationship with said creators.
No one knows this quite like Coletrane Marx, the only son of an eccentric billionaire archeologist, who one night as a child unwittingly created a tulpa himself; one that visited him in demon form in the middle of the night to murder his parents with a samurai sword.
Forever changed by this trauma, Coletrane grows up to inherit his father's obsession with archeology and to discover that his unfiltered, childhood imagination created not only this mysterious, cursed samurai named Kojiro, but also an alternate feudal history wherein the strong-willed warrior has his own prophetic story in a world full of mythic creatures, powerful humanoid animal Lords, living deities, and evil Tricksters. A world, Coletrane in addition learns, that will overlap with his own in catastrophic ways if he and Kojiro do not reconcile their dark, shared past and come together as one to stop it.