Create a gothic artwork with a slightly elongated rectangular shape for the back of a t-shirt. The design features Nyx, the goddess of the night, standing at the bottom in detailed, flowing robes with intricate folds, her dark and ethereal presence commanding the space. Above her, a raven with detailed feathers is perched, its wings partially spread, showcasing its dark and menacing form. At the top of the composition, a crescent moon glows faintly. The artwork is surrounded by a richly detailed gothic frame, adorned with ornate, sharp-edged patterns, reminiscent of cathedral windows and ancient stone carvings. The design should be in black and white, with a focus on gothic detailing, shadows, and depth, giving the artwork a dark and powerful atmosphere, perfect for a t-shirt.