The Cross of St. Boniface

A knight in the service of the Teutonic Knights goes on a quest for an object that may lead to the destruction of humanity, only he is unaware. He comes in contact with others who will either help him or kill him Set against the backdrop of Eastern Europe, The Cross of St. Boniface starts in the cursed city of Starybogow, then travels the Ottoman Empire as Djin and Eldar gods battle for the souls of humans