Karen Quinn was an archeologist who while on a dig unearthed a strange amber stone. The stone infused her with a divine power tracing back to the Garden of Eden and the expulsion of Adam and Eve. She became Lionheart and used her strange magic to defend herself from the evil Blackheart and aid the Coven in battle.
The amber stone she wields give Lionheart access to ancient mystical powers, which she can use to fly, enhance her strength, and shield herself with a magical aura. She can channel her magic through her hands in intense blasts of divine force, or though her eyes in beams of celestial fire.