There are 3 books in the The Enduring Flame series. The newest book is The Phoenix Transformed which came out in 2009.

1
The Phoenix Unchained

By Mercedes Lackey , James Mallory ,

Book cover of The Phoenix Unchained

New York Times and USA Today bestselling authors Mercedes Lackey and James Mallory teamed up to write The Obsidian Trilogy, set in a wondrous world filled with magical beings, competing magic systems, and a titanic struggle between good and evil.

That world proved so popular with the creators and readers…

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2
The Phoenix Endangered

By Mercedes Lackey , James Mallory ,

Book cover of The Phoenix Endangered

In The Phoenix Endangered, second in The Enduring Flame, Tiercel, a budding High Mage, and Harrier, a reluctant Knight-Mage, develop greater power—and learn of the evils of war when they see the devastation caused by the fanatical armies of the Wild Mage Bisochim.

The desert tribespeople led by young Shaiara…

3
The Phoenix Transformed

By Mercedes Lackey , James Mallory ,

Book cover of The Phoenix Transformed

In the Enduring Flame trilogy, Mercedes Lackey and James Mallory have given readers a new view of the complex and fascinating world they originally created for the Obsidian Trilogy.  Jumping one thousand years in time, Lackey and Mallory have told the compelling story of Harrier Gillain, the first Knight-Mage in…