Race: Demon (Etherious) Affiliation: Tartarus (Dark Guild; One of the three ruling Dark Guilds of the Balam Alliance) Mard Geer is an Etherious, a demon born from one of the Book of Zeref, the acting Guild Master of the Dark Guild Tartarus and is known as the "Underworld King." Like the other members of Tartarus, he has a Curse, a powerful version of Magic. In this case he has the Thorn Curse which allows him, through the use of several hand gestures, to create, as well as manipulate, thorns at his own will. The thorns are powerful enough to strangle and, at the same time, severely damage opponents. The attacking thorns can even pass through the body of the target, as well as serving as a protection for him.