In December 2017, Kinberg revealed that the film would be in post-production for almost a year, longer than usual for the series, because he wanted to take the time to get the visual effects right by focusing on the "nuance" of the effects rather than the scale. He also explained that he "felt in his gut" that this was the story that he needed to tell once Singer left the franchise, and that his vision for the film was "so clear in my head, emotionally and visually, that it would have killed me to hand this to somebody else to direct". The film was described as being the most sinister and somber of the franchise, with McAvoy finding it to be the most emotional of the X-Men films he had worked on. It becomes a "fight for Jean’s soul" and features a twist that was intended to have significant repercussions on the entire franchise. Lawrence revealed that she had worked to convince Kinberg to direct the film, and had promised to return for it if he did so, despite her dislike of the make-up required to portray her character. It was also revealed then that the film would be introducing a version of the island Genosha, adapted to the film as a mutant refuge led by Magneto, and that it would focus on the female characters more so than previous films in the series, particularly Jean Grey as both the hero and villain of the film, and Chastain's character with whom Grey has a complex relationship.