Meliah

Meliah is a Wind Elementalist first introduced in A Path to Flight and Unity. She comes to Avia, hoping to train her to fight after hearing she has been visited by the Spirits of the Elements.

(Spoilers ahead )

When Meliah and Avia are attacked by an Umbroc, it kills Meliah and flies away, despite their attempts to kill it. After she is buried, it is revealed that Amoria has reanimated her in exchange for her services. Meliah agrees.

When Avia and her friends enter Bear Cliff, they meet Meliah's spirit again. She attacks Avia, and it is revealed that she has gained control over all the elements, thanks to Amoria. Avia feels slight compassion and pity for her at first until Meliah tortures her, bringing her to an elevation where she has trouble breathing. After Avia, Lindon, Mackenzie and Quixie return to the Elemental Organization, Meliah is not seen until book two.

(MAJOR SPOILERS AHEAD)

In the second book of the Wind Saga, it is revealed that Meliah and Quixie are cousins. After Meliah tries to kill them in the passage from the Organization to Hydro's Lake, Quixie snaps, killing Meliah. Meliah finally apologizes for her actions as she is dying, while Quixie does not know whether to apologize to Meliah or not, after attacking in self-defense.