Heretic: Betrayers of Kamigawa

Heretic: Betrayers of Kamigawa is the second novel in the Kamigawa Cycle, which started in Outlaw: Champions of Kamigawa is continued and Guardian: Saviors of Kamigawa. It is written by Scott McGough and was published in January 2005.

Blurb
A rogue warrior struggles with loyalty.

Now in the employ of Princess Michiko and beholden to the Myojin of Night's Reach, Toshi Umezawa tries to honor his commitments while pursuing his own ends.

But as the Kami War threatens to engulf Kamigawa, an unimaginably powerful spirit beast threatens the world. And at the heart of the battle moves the figure of the Daimyo, whose impassive features conceal a sinister crime that gnaws at the world's heart.