Given the question: Build a movie plot around this: Why did Lucifer arrive? He wants to collect Constatine's soul
The answer is:
John Constantine (Keanu Reeves) was born with a gift or a curse to see demons and angels walking this earth disguised as humans. Demons and angels cannot make a person do anything, but they can whisper in your ear and give you an urge to do it. As a child, John could not understand what he was seeing, and he had enough of this life and wanted to leave this cruel world by killing himself. Unfortunately for John, he is saved from death, and now must atone for his act. John is given extraordinary powers, and becomes a guardian on earth. Whenever a demon breaks the rules, John exorcises them and sends them back to Hell. John is known by the police for working in the supernatural field of the occult, and Los Angeles police detective Angela Dodson (Rachel Weisz) wants his help in her investigation. Angela has discovered that spirits are walking the earth, and she believes they had some connection to the suicide of her twin sister. Angela becomes aware that John can see these spirits, and she wants to see them too. John reluctantly grants her wish. John and Angela must deal with representatives of both Heaven and Hell to save humanity. Douglas Young (the-movie-guy)Set in Los Angeles, California, John Constantine (Keanu Reeves), a chain-smoking cynic, has the ability to see half-angels and half-demons true forms. He seeks salvation from eternal damnation to hell for a suicide attempt in his youth, by sending half-demons back to Hell with his sidekick Chas (Shia LaBeouf). However, full demons have begun attempting to cross over. Disturbed by this information and with his death looming over him due to lung cancer, Constantine seeks an audience with the androgynous half-breed angel Gabriel (Tilda Swinton). Gabriel tells him that as he does his exorcisms to escape Hell and for his own benefit, they are vain acts that wont spare him. Departing, he encounters LAPD officer Angela Dodson (Rachel Weisz), investigating the death of her twin sister Isabel, who leapt from the roof of the mental hospital she was committed to....