The Enlightened Language is the universal language that the elves and all the other intelligent species speak, excluding Humans. It is said to sound like a baby babbling to normal humans. Elves start speaking the Enlightened Language from the moment they are born. Della once explained how cute Elvin babies are when they are first born and say "hello" to their parents, and Sophie was momentarily surprised due to her forgetting Elvin newborns' fluency in the language.
After Sophie's human family's memories were wiped in Book 1: Keeper of the Lost Cities they were given a subconscious understanding of the Enlightened Language. Though the elves are born knowing the Enlightened Language, they are still able to learn other languages, as Dex did in the first book, telling Sophie he could also speak English. There are two versions of the written language: a formal version using the ancient alphabet and a simpler version which is used most of the time.
- Suldreen - Moonlark