Extreme Eternal Demon, also known as EED and 极道长生魔, is a gripping Chinese web novel that follows the journey of a terminally ill individual who, after a spiritual rebirth, sets out on an extreme quest for immortality. The protagonist challenges the established order by aiming to become a deity surpassing Gods and a figure transcending Buddhas. Filled with martial arts, psychological depth, supernatural elements, and tragic twists, this Xuanhuan novel features themes of determination, cunning, and ruthless ambition, making it a compelling read for fans of complex characters and intense storylines.