Slumberberry Tea is a mild sedative often used in the Lost Cities. It is said to be a shimmering amethyst color. It is kept in store at Candleshade, as shown through the multiple times it was referenced to have been used on the residents. Lady Gisela has provided this beverage both to Keefe, when he was mourning Sophie's "death" in Keeper of the Lost Cities, and Lord Cassius who had taken three cups daily. In the Book 3: Everblaze, Sophie, despite her dislike for sedatives, had requested it, drinking the liquid in response to her ability restricting circlet. The beverage is made of slumberberries which grow on bushes, and in their scorched form that appeared in Nightfall seem comparable to raisins.