As we learn that all celestial bodies have their avatars, in the season finale of season five Dylan realizes that Maura is not the Avatar of a sun but actually the Avatar of the abyss.
She first presents herself as head of the Lambent Kith Nebula council of solar Avatars. Trance recognizes her and kneels as she approaches which may suggest, either she has always existed as the Abyss' avatar and merely infiltrated the sun council long ago or the Abyss' Avatar replaced an original sun Avatar named Maura, taking her place. She commands the council and leads in their decision making.
In the very final episode Dylan realizes that she is responsible for Earth's destruction and the ambush of the Andromeda by the Nietzschean fleet. He battles with her but she easily incapacitates him until Trance comes. They have a duel of words and she fades away.