Glass Guardian. Sword Dance

One book - two stories by the famous Russian writer Dmitry Yemets about the adventures of "Mefodiy Buslaev" - "Glass Guardian" and "Sword Dance"!
Books about the difficult choice of a teenager who unexpectedly becomes the heir of Darkness. But Mefodiy Buslaev does not want to become the new Dark Lord; he must follow his own path!
In the thirteenth book, "Glass Guardian", Praskovya may become the legitimate ruler of Darkness, Mefodiy regains his memory, Aida Plakhovna tries to take the heart of the necromancer, Daphne is getting ready to return to Eden, and the Baron of Darkness must deliver Mefodiy's head to Ligul.
In the fourteenth book of the franchise, "Sword Dance", Mefodiy will again have to fight with Arey, and this battle may be the last for both the student and the teacher. The Dark and Light are searching for lost artifacts, and Irka may lose her Valkyrie powers forever.

Dmitry Yemets is a well-known author for children and teenagers, with a total circulation of his books exceeding 7 million copies! 
"Mefodiy Buslaev" - a series of books that opened magical worlds to millions of teenagers. Fans of the series regularly confirm this at meetings with the author.