A Japanese ninja sneaks into the castle of the German emperor on a secret mission. The Tatar noyon takes part in a knight's tournament. The Nicene sorceress princess, heir to the Byzantine throne, marries a Russian prince-magician, but hides her true thoughts from her husband... In this world, intrigue, witchcraft, magical duels and bloody fights are the order of the day. Here, the magical Dark Paths, concealing space, allow you to be transported to unimaginable distances. And somewhere here is hidden the Black Bone - an ancient relic capable of giving unheard-of power.