Mercedes Lackey is one of my favorite authors. There are currently 4 books in the new series she and James Mallorey have been co-authoring. The original trilogy ‘The Obsidian Trilogy” contains The Outstretched Shadow, To Light a Candle and When Darkness Falls. The Phoenix Unchained is the 4th from this series and looks like it’s gonna start up a new trilogy. It’s got great characters, a fun and creative magic system, and while the bad guys are a little predictable, it doesn’t even begin to dent an otherwise great read. The world they paint in your head is beautiful, and even the minor characters are well rounded. I highly recommend it.
Some other books I recommend from Mercedes Lackey are:
Heralds of Valdemar:
I like the rest of the Valdemar stuff, but these are my favorite out of them.