Fanha confronts the party when they enter the Tree Palace, but is ordered to stand down while Sheex deals with them and leaves with the Emperor to find the Mana Fortress. After the party kills Aegagropilon, they break the seal on the Mana Seeds, raising the sunken Lost Continent and unsealing the Grand Palace.
Fanha confronts the party again and attempts to avenge Geshtar and Sheex, only for the Emperor to intervene telling her the Empire has no time to waste on children. He orders her and the soldier accompanying them to press on and heads off with the soldier while Fanha follows him, enraged to the point where she begins plotting against the Emperor.
When the party meets Fanha again, after discovering Emperor Vandole's corpse, she admits to killing him so that she and Thanatos could claim the Fortress and take over Fa'Diel for themselves. She then uses the power of Mavolia to transform into her true form Hexas and does battle with the party. In spite of her demonic alter-ego's immense magic power, she meets her demise by their hand in her turn asking Thanatos how she died in disbelief (even saying the words "This cannot be" in the remake).