Silvian is the language of the fairies. It can be intuitively spoken and read by those who are fairystruck or fairykind, and is quite difficult to learn otherwise.

The contents of the Journal of Secrets written by Patton Burgess were entirely transcribed in Silvian, as was his message about the Chronometer in the vault of Painted Mesa. Several warning messages at the entrance to the Inverted Tower were written in various languages dervied from Silvian.

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