The Twilight Terror emerged when the first shadows crossed Professor Hess's experimental rift at dusk. This creature is literally made from the unstable boundary between dimensions during twilight hours. It appears only during those fleeting minutes when day becomes night, stalking the course with unnatural patience before vanishing with the last traces of sunlight.

The Twilight Terror exists in a semi-corporeal state, its form constantly shifting between shadow and substance. It moves silently across the course, visible only as a distortion in the fading light. The creature can manipulate shadows to create false obstacles and disorient its prey. Its only weakness is direct light from glow-in-the-dark discs, which temporarily solidifies its form.

The Twilight Terror serves as a guardian of the rift's transitional periods, preventing interference during the most vulnerable moments of dimensional instability. It specifically targets Monster Hunters attempting to study or seal the rift during twilight hours.