Sierra

"'Her eyes lingered on mine for a quick second before she looked towards Cole's direction. Her hand stealthily moved behind her back and with two fingers, she gestured for me to keep crawling.'""— Noelle's encounter with Sierra."Sierra Debrovie is the second-in-command for Lux, an organization that plays a large role in the Darkness Within universe. Unlike Cole, her fellow co-worker, Sierra seems to be an ally with Noelle, the main protagonist of The Darkness Within.

Personality
Within the first chapter of The Darkness Within, Noelle encounters Sierra who secretly allows her to continue escaping Lux. From this small engagement between the two characters, it is clear that Sierra is more compassionate and warm-hearted than her groupmates. As described by Noelle, she took on a motherly role when Noelle was taken by Nathaniel and treated her differently than the other prisoners.

Physical Appearance
Sierra is described as a young average height woman with a "calming set of green, almond-shaped eyes".