Fantastic Beasts discussion: Was Ariana Dumbledore an obscurus?
While still unconfirmed, Ariana Dumbledore was potentially an Obscurial too, as the description of her “illness” given by her brother Aberforth fit the description of an Obscurial; “It destroyed her, what they did: she was never right again. She wouldn’t use magic, but she couldn’t get rid of it; it turned her inward and drove her mad, it exploded out of her when she couldn’t control it, and at times she was strange and dangerous. But mostly she was sweet and scared and harmless”. Furthermore, if she was indeed an Obscurial, her interactions with a young Grindelwald, could also explain why the Dark Wizard was later so interested by the power of Obscurus. Ariana also lived longer than the average Obscurial, having died at the age of 14, whereas most Obscurials, with the exception of Credence Barebone, didn’t live past age 10. If Ariana was an Obscurial, then this was a fact kept hidden by the Dumbledores, since it was widely believed no Obscurial had existed for at least two hundred years, even thirty years after her death.