The language of the elves of Serala from the Archipelago setting is written in circular logographs. These are the logographs found in the folio mentioned in book 1, The Heir to Thorns and Steel.
I found these notes about the spoken language:
Words to work from:
Vrakael
Kelu
Kolivaris
Amhric
Oshuvre
Vowels
AH AY EH EE IH OH OO
Haven't seen an "eye" yet, or an "uh."
Consonants
C D F H J K L M N (P?) Q R S T V (W?) Y (Z?)
When transliterated, "k" might only be used at the beginning of a word. A hard "k" at the end of a word might be written "c."