Kallista possesses a slender, athletic frame and deep mahogany skin that shimmers slightly in low light. Her black horns sweep back from her forehead in elegant, textured curves, and her prehensile tail constantly twitches with nervous energy. She has amber eyes that seem to catch every glint of light, and she wears practical, dark leather armor with many hidden pockets.

Wary and sharp tongued, Kallista projects the image of a cynical street tough to protect herself. Beneath the bravado, she is deeply empathetic and finds it difficult to ignore those suffering in the ways she once did. She values silence and efficiency over glory or gold.

Born in the soot-stained alleys of the Lower City, Kallista was raised by a crew of cutthroats known as the Lowlight Syndicate. They prized her for her natural tiefling grace and keen vision, training her to be a master of entry and exit. For years, she functioned as their premier lockpicker, believing that the world was simply a place where the strong fed on the weak. This changed when she was ordered to sabotage a community center that provided for the local poor. She couldn't bring herself to do it. Instead, she looted the syndicate's local safehouse and used the funds to relocate the residents. Now, she is a marked woman, living in the cracks of the city. She uses her criminal skills to pay a penance she believes she can never fully satisfy, acting as a ghost who robs from the corrupt to support those the law has forgotten.