Obscurial

An Obscurial, is the host of a dark force created by young wizards to suppress their magic due to constant physical and psychological abuses in their childhood because of their latent powers. This dark force take the form of an Obscurus, a flying, incorporeal, and amorphous entity with the appearance of a black, almost fluid-like cloud or a violent torrent of darkness. When their host begins reaching their emotional and mental breaking point, the entity appears near them and attacks whatever is the source of their distress, while when they lose control of the entity completely, the host can physically transform into it and destroy everything in their path. However, being calmed down can cause them to revert to their corporeal state, though being emotionally conflicted at that point causes the Obscurial to transform back and forth between their normal and Obscurus form.

Usually, the child possessed by the Obscurus dies around their 10th birthday, but as exemplified by Credence Barebone, a wizard with tremendous latent powers can survive longer. When the child dies, the Obscurus vanishes along with them, though Newt Scamander successfully kept one alive when its host died by encasing it in a magical bubble.

Known Obscurials

 * Sudanese girl — A young girl who was abused by her village because she exhibited magical abilities. She died when she was eight years old, with Scamander preserving her Obscurus before her death.
 * Credence Barebone — Regularly beaten and psychologically abused by his adoptive mother who hated magic.

Believed Obscurials

 * Modesty Barebone — Looking for a child possessed by an Obscurus after he had a vision about the coming of an immensely powerful Obscurial, Gellert Grindelwald briefly believed that she was the Obscurial instead of her adult adoptive brother.
 * Ariana Dumbledore - attacked by three Muggle boys at the age of six, couldn't control her magic afterwards.