I'm a fan of Bravely Default and I love all the stories in the game.
I am a little intrigued about the others vestals, (The Fire Vestal committed suicide and the Earth Vestal was assassinated) they don't appear in the game so I try to make some concepts about these Vestals and try to think what would they do if they were still alive or something else.
I think the Earth Vestal was in the corrupted side of the Orthodoxy and was really in the role of a prophet or something like that, I don't think she was worried about people or Cristallists, just about her mission, worship the cristal and nothing else.
She would be also the oldest Vestal and the more conservative.
I think if she was not killed in the game, she would tried to reinstall the Orthodoxy in its former glory by force.
I don't have many ideas about her design but I don't think the Garb have to be the same for all vestals, So I opted for a long dress.
The Hexagon symbol is for me a symbol of earth (if someone have better ideas please share).
(Ah and I was too tired too draw legs, that's why I made her a phantom...