Your main adversary is Springtrap, a highly aggressive animatronic that will actively hunt you down. He moves through the camera feeds and ventilation shafts. Your primary defense against him is the Audio Lure, which can be played on any camera to draw him to that location. However, the audio lure has a cooldown and can only be used effectively if Springtrap is within hearing range. The Phantom Animatronics (Phantom Freddy, Phantom Chica, Phantom Foxy, Phantom Mangle, Phantom Balloon Boy, Phantom Puppet) are hallucinations that appear randomly. They cannot directly kill you, but their jump scares will cause system errors, primarily ventilation failures, which can leave you vulnerable to Springtrap. Avoiding their jump scares by quickly changing cameras or looking away is crucial.
