After surviving the Abyssal Floors, Evan and Mara thought the nightmare was over. But the building has extended beyond its walls and spread into the city like a living organism. Strange doors appear in offices, homes, and factories. These doors pulse, watch, and remember. Mara is tormented by visions from the depths. She hears whispers of shadows moving beyond the floors. Evan gets messages from other survivors. Each one shares their own traps, horrors, and strange events. The building is no longer just a place; it is a presence that shapes and infects the world. Now they must go back to the heart of Floor Zero. This is a place of shifting corridors, impossible architecture, and a living intelligence that reacts to every move, thought, and fear. To stop the building from consuming everything, they must confront the Core itself. They will learn that survival is not only about escape but also about choice, courage, and understanding the intelligence that hides beneath reality. This story is perfect for fans of supernatural horror, liminal horror, and mind-bending thrillers.