The Ar Ciela Language アル・シエラ言語, aru shiera gengo?) is the language commonly known as the "Language of the Planet," and it is not a language used by the humans. This language is used when the Planet Ar Ciel wants to express Her will and intention, and also when the Planet wants to craft something (comparable to Earth's activities ranging from weather, to volcanic and seismic activity, to the cycle of life itself). In such situations, Ar Ciela is used to materialize those wishes of the Planet. It could be said that Ar Ciela is the origin of everything that belongs to the Planet Ar Ciel, and was also the initial point for the development of the Carmena Foreluna language, which in turn also served as a predecessor for Hymmnos.