Dwala

 was the Voice of the Tempest prior to Keyleth. Either her death was the reason Vilya went on her Aramenté or she died of illness while Vilya was on her Aramenté, forcing Vilya's husband Korrin to act as the leader of the Air Ashari until their daughter Keyleth was of age to begin her own Aramenté and eventually become the new Voice of the Tempest.