From Diablo Wiki
The Vecin are a nomadic spiritual clan, from Kehjistan who are blessed with magical visions.
They hail from a matrilineal society who worship a powerful deity known as the Allmother. The Vecin believe that the Allmother is the source of their visions, and that it is because of her that all Vecin possess a sixth sense they call the Sight. While the Sight always manifests more strongly in Vecin women, it’s especially strong in Myriam Jahzia, the Mystic.
The Blacksmith, Haedrig Eamon and Mira met when they both joined the Vecin caravan. A mystic spotted Mira's innate talent and under her tutelage Mira became an accomplished mystic. Unfortunately she later becomes infected with a plague and was put out of her misery by you on the Shattered Crown quest.