The world in which the main character was born was divided into two powerful empires. The light empire of Eldria and the territory of the demons Nirgiiz. For more than one generation, there has been confrontation between them on all fronts. One BUT - the battles took place not only on the borders. The fanatical ruler of the bright empire strictly monitored the cleanliness of his territory. And he controlled that people with a darkened aura were immediately executed. He didn't care why this was happening. He simply believed that once a person’s aura began to darken, it meant that evil was appearing in his heart. And he didn't care who became the unfortunate victim of his vigilante squads. Be it children or old people, men or women. There was only one verdict. The main character is a descendant of a mighty family of thunder knights, still just a boy, who has just passed part of the exams at the local academy of magic. Like his father, he was destined to become a thunder-class battle mage. Only the old lady fate had other plans for him. His aura turned grey. Having miraculously escaped from the capital, he begins his journey, in which he learns that he is destined to become a man from legends. To those who are reborn every time the forces of light and darkness reach their peak and prepare to flood this world with blood. Gray fog. The third power after light and darkness was granted to an inexperienced boy. Third in order, but not in power. What will be the path of a person who has lost everything? Will he take sides? Or will it become some kind of symbol of true harmony and justice, which is so lacking in this world split in half?