The newest arrival at the facility, whose power is to build other people's fears where everybody can see them.
Danielle Moonstar is a Native American mutant who can create illusions based on what other people fear and want. Blu Hunt plays her, and she is the point of view the film is built around: she arrives at the facility last, so the audience learns the place with her.
Her power is also the film’s mechanism. Once you know what it does, everything that has been happening in the building has an explanation, and the horror is that it is not anybody’s fault.