Gatekeeper. Dyachenko M. Yu.

In 2005, Marina and Sergey Dyachenko were recognized as the best science fiction writers in Europe. Before you their very first book.... There is an ancient prediction that one day, when the gold begins to rust, an unknown third force will come to the world, which the gatekeeper will let in, opening the door to this world. And the world will turn inside out, and first of all magicians will die. Rual Ilmarranen, a former magician who has lost his abilities due to double betrayal, is the main candidate for the post of gatekeeper, a person who will be inclined to the whole clan of human.