Midknight’s powers visible from far away

She’d glanced back away from the street and was frozen. One of the other guards, a man with a dark unibrow turned and his jaw dropped. Ilya threw a look over his shoulder.
Looming over the buildings to the west, a huge sphere of blackness swelled, so dark they could see its edges against the night sky.

Excerpt From Ex-Heroes, pg 422
Peter Clines
https://books.apple.com/us/book/ex-heroes/id585738407