breaking point their eyes turn a milky white and the Obscurus can be observed writhing under its host's skin. When unleashed an obscurus will normally target the source of its host's misery and distress; violently mauling the victim and leaving distinct scratch-like burns over the victim's face. Despite their violent nature an obscurus will spare those who have shown kindness and affection to their obscurial host. Obscurus and obscurials play a crucial role in the film Fantastic Beasts and Where to Find Them, Fantastic Beasts author Newt Scamander expressing guilt for not being able to save an obscurial girl he met in Sudan. In the film's storyline, an Obscurus manifested in 1926 New York in the body of Aurelius Dumbledore, previously known as Credence Barebone who was forced to conceal his magic from his abusive adoptive mother who has formed an organization to persecute witches. Credence was sought by Gellert Grindelwald and drives him to wreak havoc across the city before he was seemingly killed by aurors under orders from the President of the Magical Congress of the United States of America, Seraphina Picquery. Credence ultimately survived this as a fragment of his obscurus escapes notice and reconstitutes him, retaining the entity throughout the events of Fantastic Beasts: The Crimes of Grindelwald while learning his true identity and later showing some control over it. In Fantastic Beasts: The Secrets of Dumbledore, it's revealed that Dumbledore's deceased sister Ariana was also an Obscurial, having been traumatized as a young girl by an attack by Muggle children who had seen her performing magic. Credence, who is revealed to be the son of Aberforth Dumbledore, can now use both his magic and Obscurial abilities, but Dumbledore reveals that Credence's own nature is slowly poisoning him to death and he can't be saved. Thestrals Thestrals are an elusive, carnivorous species of winged horse, visible only to those who have witnessed and embraced a death, and described as having "blank, white, shining eyes," a "dragonish face," "long, black manes," "great leathery wings," and the "skeletal body of a great, black, winged horse"; also described by Hagrid as "dead clever an' useful", and also by Harry as "reptilian". They have acquired an undeserved reputation as omens of evil. The High Inquisitor from the Ministry of Magic, Dolores Umbridge, asserted that Thestrals are considered "dangerous creatures" by the Ministry of Magic, although this might be due to