Celestial

Celestial is the language of Heven, followers of The One Above All, and of several other dieties. The language supposedly comes from a higher plane and is very difficult to learn, using a lot of systems that don't make sense to the traditional sentient speaker, but is very good at high detail speech with a prefix-suffix system that is very complex.
Celestial is one of the Empowered Languages, with many calling it the "speech of all living things." Celestial seems to have a strong positive feeling gained from listening to it, a soothing quality that surpasses understanding of what is being said.