Dheania, Goddess of Fear, aka The White Horror of the Waxing Moon. Primary antagonist of The Deathscape Mythos novel The Revelation.
Although she has many forms, and has been seen in many sizes, her typical form is a three-headed, obese lioness-like predator with matted and disheveled fur. In this form, she stands 43 meters at the withers, and is 62 meters in length from head to tail. That is about 141 feet at the shoulder, and just over 204 feet from head to tail! Needless to say, she has been described as "too massive to take in at once".
This is an old drawing that has been redone to be more accurate in regards too to the novel's depiction.