Main Rolle in a Horror film, Letun

"Two girls are sitting in the beddrom with the lights off , candles and the neacles in tthe middle of the room. One of the girls has an old book with the unnown langugage. One of the girls doesn’t believe in demons, so she wants to prove it to her friend, that there is nothing ti be affraid of. They starting to summon a demon, but because they dont know the language nothing happens, until the unknown man is coming out of the darkness. Man is introducing himself as Letun. Girls are terrified and they are trying to communicate with him so he leaves, but instade he captivates one of the girls with his charms and kidnapes her."
The short film will be in a horror genre wich is based on a slavic mythology. I'm only using one of the charakters of this mythology named "Letun", you can read about him in Wikipedia.
https://en.wikipedia.org/wiki/Fiery_serpents
It is an assignment at 2nd Semester for my studies at SAE Institut for Film Produktion in Berlin, but i will also relies it in YouTube, so our Cast&Crew could use it for their portfolio. Production will be in English. For the referens you can watch my Film from the 1st semester (in German)
https://youtu.be/vP567V9GL30?si=EOvQyadw2kaIbDYG

!This rolle requiers a knowledge of a slavic language (Polish, Ukranian, Russian, Slowenian etc.) !
A Fiery Serpent, also known as a snake-Lubac, Letun, Letuchy, Litavets, Maniac, nalyot, ognyanny and prelestnik, is an evil entity common to Slavic mythology, which presents itself as an anthropomorphic snake demon. According to folk beliefs, the Letun flies in the form of fire with a long trail ("tail") and can be seen in the sky. If it flies over a house, the household will fall into decline. Once inside the house, it takes on the likeness of a deceased loved one, usually a man. Incarnated in the image of the deceased, the ghost can enter into marriage with living people. At night, he seduces women, brings gifts, but with the sunrise they turn into dung or shards. He also scatters jewelry on the road, and whoever picks it up without a blessing is chosen by the overgrowth as a victim. Gradually, the overgrowth takes away health and intelligence, eventually leading to death.