Peter Barmer. The book is in third (№ 287169)

One boy's whole life was preparing for a decisive battle with Evil. Evil did not even know existed, it lived quietly in his castle black and built all sorts of machinations. The boy, meanwhile, was absolutely serious. He tormented himself by training to become an invincible warrior. It ruined vision and dislocated brains over ancient manuscripts, polishing his skills mage. <...> Finally, at the peak of his form, he decided that he was ready. Evil and safely died in his bed two days before his arrival. Well, could not a dirty trick at last!