The Chlorofiend is a magical construct that took the form of a plant monster. It had a vaguely human shape and was made of earth, root, and bough. It had two emerald-green lights in its head of writhing vines and leaves. It was about nine or ten feet tall and almost that wide. Its legs were as thick as a person. There were branches that stuck out like horns. Its scream sounded like tortured wood. As a Faerie, it is sensible to iron and steel. Originally called a plant monster, Harry decided it didn't seem right and used a term he heard Bob use.