Tal-Vashoth literally means 'True Grey Ones', former members of the Qunari who have departed or been exiled from their people and home. Vashoth, or 'Grey Ones' are those of the qunari race that were born outside the Qun. It also refers to those who have rejected the Qun but aren't rebelling against it.

A sorcerer...so if I'm right about the way it's worked with other rifters, your own magic is innate? That's how all mages here function, since it's inborn and will manifest at some point.