Wow! Sombra is really scary in this one. How do you get away from a shadow that can travel anywhere?

The black mare turned a cold-eyed gaze to her. It was not intentional, but her soulless, all black eyes always gave the impression she could look straight through ponies talking to her. “Rest?” she echoed. “Rest is done. No more, not ever again,” she muttered. She paused to look out over the waters of the turbulent ocean to their west.

How is it that she has eyes like this? Are they from some kind of ritual, or was she born with them?