Smith by Sam B Miller II

Jakes discovers a 3,000 year old ring with the power to control demons as well as the weather and all animals. Jake starts to hear a voice that belongs to Smith, the computer-like interface who gives him guidance on how to deal with his newfound powers. Smith’s single goal is to insure Jake is King of Earth with an appropriate Queen chosen by Smith. Both a rogue government and a secret society want the ring and its powers for their own wicked scheme. Smith’s methods for protecting Jake are prone to violence. Jakes teams with Nava, a no-holds barred woman with unique training. Smith doesn’t like her hair. The government and the secret society have just met their match.