Kallista is a tiefling of striking ruby-red skin with long, obsidian hair tied back in a complex braid. Her horns are dark and swept back, decorated with several intricate gold bands and small dangling rubies. She has solid amber eyes that lack pupils and a tail that twitches restlessly when she is bored. She dresses in fine silks and polished leather, always looking slightly more upper-class than the current setting dictates.

She is charming and quick-witted, possessing a silver tongue that she uses to navigate social obstacles. Kallista maintains a cool and collected exterior, rarely letting her true emotions show unless it serves a tactical purpose. She views most social interactions as a game of stakes where the most prepared person wins.

Born in the slums of a city that viewed her infernal heritage as a curse, Kallista learned early that people were easily swayed by a confident voice and a pretty lie. She spent her youth as a street magician and a small-time grifter, eventually graduating to complex long cons targeting the local aristocracy. She created the persona of Lady Vane, a displaced noble from a fallen house, and nearly succeeded in marrying into a wealthy merchant family before her cover was blown. Trapped in a damp cellar with a hangman's noose in her future, she reached out into the void for salvation. A voice from the lower planes answered, offering her a dark pact. She traded a portion of her soul for the power to manipulate reality and escape her captors. Now she wanders the world, using her new powers to ensure she remains the master of her own fate, always staying one step ahead of those she has fleeced while occasionally paying the tithe of souls her patron demands.