Cassie St. Commons was once a normal girl. She enjoyed standing out in a crowd, with her jet black hair, tongue and nose piercings, and even a tattoo on her face. She was invited to join the group Slingers by the Black Marvel. Cassie accepted, and then had to participate in an initiation rite. She was told to jump from the roof of one building to another. While her teammates had access to an array of powers to help them make the jump, Cassie did not. She fell to her death.

She was then reborn, no longer dead, but not exactly alive either. She was Dusk. Upon her revival, she found she had the ability to teleport anywhere via swirling shadows, as well as a precognitive ability that allowed her to feel where her teammates were, and if they were in danger. Later, she also developed the ability to manipulate shadows, as well as transport groups of people.