Lackey's Foundation series (Valdemar books)

There are at least four books in this series.  It follows the adventures of Mags, an orphan raised in a gem mine, who becomes a Herald during the time that the Heralds of Valdemar switch from being trained by individual mentors (as in Vanyel's day) to becoming trained in a Heraldic Collegium, as in Talia's day. 

So far there are three books: Foundation, Intrigues, and Changes, with Redoubt being released in October of this year. 

( Cut for length. I tried to avoid major spoilers, but I do cover the obvious points like Mags getting chosen )

Personally, I'm off to reread  Magic's Pawn. 
Vanyel&Tylendel/Stefan OTP!