Adamant Fern's first age incarnation, the first sorcerer and the Mother of All Spells. She was clearly an important and influential person in the First Age, but there appears to be some sort of effect in place preventing information about her from being easily gathered. Leviathan is unable to speak her name or tell of her deeds, and Cid seems perfectly capable of talking but his memory has been damaged. Books that mention her personally replace her name with a smudge. Serentatis revealed that she crafted the Castestones.
Interesting to note is that while everyone else's Essence Shard faded to black in the portrait, she disappeared entirely, and was the first to do so.
Dragon-Blooded believe her works to be those of the first Dragon-Blooded sorcerer, "Mela".
A few sources of information suggest that she was involved with saving the Lintha.
Judging by some of the description in the Coatl Operations Manual, she had something of a penchant for weaponry.