The Stronghold (2017)

Plot

A solar eclipse unlocks a mystical time portal, transporting Vit'ko, an ordinary schoolboy from the 21st century, back a millennium. There, he encounters legendary heroes: the young Oleshko, the formidable Ilya, and the stern Dobrynya. Together, they confront the menacing cumans, who threaten to annihilate Rusichi through brute force and dark sorcery. Immersed in epic battles against mythical beasts, Vitya discovers his own bravery amid the chaos of this extraordinary world, transforming from a mere boy into a courageous warrior in the face of danger.