Witch of the Wilds is the name given to members of a group of apostatemages living in the Korcari Wilds. They are not a clan, so much as a superstitious name the locals of the Korcari Wilds have given to the infamous Flemeth and her daughters, one of them being Morrigan, another being Yavana. The Witches of the Wilds are known to be powerful shapeshifters.
Known Witches of the Wilds
Flemeth, who implies that she has more than one body in Dragon Age 2