Castanic is not an individual character but rather a playable race in the MMORPG Tera: The Exiled Realm of Arborea. Known for their cunning, agility, and striking appearance, Castanics are distinguished by their horns and sharp features. They are considered highly skilled artisans and warriors, often excelling in rogue or assassin roles. In the narrative of TERA, Castanics have a reputation for being independent, resourceful, and sometimes mistrusted due to their checkered past, but they play a vital role in the defense of Arborea.