Imanilliandra
According to Zildran, Imanilliandra embodies all of Xerarian's desires as well as his enchantment magic. While the party hasn't interacted much with her, first impressions have her appear as a haughty, noble individual, if not a little snooty. However, it seems she is protective of the 'younger' Fia and seems to be a mother figure to her.
Imanilliandra seems to believe that she was originally King Xin's consort.