She has white hair. She is tall and aging. This means that Musarin is probably old and likely over two hundred years old.
She is guarding Leane Sharif when Egwene al'Vere comes to visit her in the cells. A bubble of evil erupts and begins to melt Leane's cell. Leane is saved when Gelarna and Musarin pull her out of the cell with weaves of Air.