Der Spiegel des großen Magus(1981)

The evil and powerful King Magus brutally subjugates the people of his kingdom. Anyone who does not want to submit is turned into an animal and locked in a cage. Magus kidnaps the girl Hanna, whom he wants to marry. But Hanna refuses, and her lover, the shepherd Elias, goes to the castle to free her. He learns from Magus' servant Pravos that a mirror gives the king magic power and immortality and that he can only be defeated by water from the Moon Lake. Elijah sets out on his journey to the Moon Lake. Will he withstand the dangers and finally achieve victory over the king? Wrid he be able to free Hanna and the whole kingdom?