Fantastic Beasts & Where To Find Them2016

Jacob:
Can someone please tell me what this Obscural... Obscurius thing is? Please?

Tina:
There hasn't been one for centuries.

Newt:
I met one in Sudan three months ago. There used to be more of them, but they still exist. It was before wizards went underground, when we were still being hunted by Muggles. Young wizards and witches sometimes tried to suppress their magic to avoid persecution. So instead of learning to harness or control their powers, they developed what was called an Obscurus.

Tina:
It's an unstable, uncontrollable dark force that busts out and attacks, and then vanishes. Obscurials can't survive long, can they?

Newt:
There's no documented case of an Obscurial surviving past the age of ten. The one I met in Africa was eight when she... she was eight when she died.

Jacob:
What are you telling me here? That Senator Shaw was killed by a... a kid?