Celestial

Considered the language of the Lumin gods by some, this language is spoken by the Lumunia people and other intellegent creatures that can be found in the Lumin realm.
Some clerics and paladins receive knowledge on how to speak this language as a gift from their Lumin gods.
It was described as beautiful, yet alien in nature, since it was developed among beings with thought patterns very unlike those of humanity and most other races. 
Celestial and Elvish share a partial dialect, but the differences between these two languages are so great that none suspect them to related.