Celestial is allegedly spoken by the angels of the Ecclesia faith. It is, by the law of the church, not meant for mortal tongues to speak, and the church has forbidden its study by all but the most devout priests.

Celestial is written in characters and those Celestial Characters are said to be used by the angels of the Ecclesia religion. The characters resemble Ecclesic Characters, but are more complicated and elegant, and there are significantly more of them. Each Saint has their own character in the script.