Our Lady Underground is a goddess that appears in Julia Wicker's dream. The goddess was believed to fulfill all the requests of Free Trader Beowulf during her summoning, but it's later revealed that the goddess was never summoned; instead, Reynard the Fox, a sadistic god, was brought forth.
She has short black hair and black eyes. She wears a white dress. She is often depicted with statues of the Virgin Mary from several of her cultural representations.
Our Lady Underground is mentioned for the first time by Richard, when he offered his help to Julia by showing her new and different way to practice magic. Since then Julia established a special connection with this goddess, starting to get mixed signals in every place; votive candles with images of Nuestra Señora de Guadalupe, pagan goddesses images, and statues of the Virgin Mary to name a few.
When Richard and the rest of the Free Trader Beowulf coven dicovered Julia's special connection with the goddess, she and Kady were in charge of looking for the goddess, collecting information in the supernatural underground, by questioning creatures like vampires and Lamiae.
Eventually, Our Lady Underground appeared to Julia in a dream, first as drops of water raining from nowhere, then as silver coins appearing out of nothing, and finally as a woman of African descent bathed in divine light. She charged Julia searching one of her followers to offer him three gifts in order to get a way to summon the goddess. Julia and Kady eventually found the man, bringing him the gift of a sprig of forsythia, a honeycomb jar, and faith instead of platinum. He accepted the gifts and gave them a scroll with the invocation in return. The group, then, set up the room with an altar with votive images of the goddess, offerings of flowers and candles; They drew a symbol on the floor and, entirely dressed in white, they held hands chanting the invocation.
The answer to the summoning was anything but pleasant, though. The entity appeared to Julia with the features of Our Lady Underground turned out to be Reynard the Fox, a trickster god who killed all the members of the coven, took possession of Richard after eating his heart, and sexually assaulted Julia amid the blood of her dead friends, except for Kady since she managed to escape.