Wow, did I just say that?
Tharma is one of the Ancestral Witches who destroyed Domino and Daphne. She is one of Valtor's mothers and the Ancestral Witches who looks the most like Stormy, one of the three descendants of the three Ancestresses and has power to manipulate the weather and storms like Stormy.
As the ancestress of Stormy, bears few similarities with her heir. She wears a long grey dress with a black cape though in her astral projection in Season 3, her dress appears maroon much like Stormy's witch uniform. Her hair is also frizzy, resembling a storm cloud much like Stormy's.
When Tharma still had a body, she looked like a hunch-backed old woman with pale skin, fizzy grayish-white hair, and a long, an outward thin hooked nose. She wore a black dress, a black cape, and a black mask. With her mask on, she appeared to have glowing yellow eyes and it is unknown if this was her real eye color or an effect of the mask.
In both her life states (living and deceased), she also sports a mask around her yellow-glowing eyes (her real eye color is unknown) and appears to be barefooted.