As with all of the Ariane, Onyx has skin the color of, well, onyx, long snowy-white hair, and grey eyes flecked with sparkling silvery motes. She is tall and slender of build, with the typical Ariane grace and air of serenity. Her dress is simple, but elegant, her cape, flowing garments and high boots are all made of spinifax, a silken cloth derived from the flax-bearing pods of the thistledown plant.

She bears a mace with an oddly smooth head and a well made bow across her back, along with a wooden shield with a simple geometric design picked out in silver paint.