The Name of Death by Joshua Robertson

Drada Koehn is a fearless, formidable fighter ensnared in a presaged war against the northern humans. When the Speaker foretells their victory upon discovery of the name of death, she sets out to unravel the mysterious prophecy. Now, bound by duty and honor, Drada faces untold horrors with her companions, searching for what may never be found. In a story of unexpected twists, she soon finds that her resolve to see the quest done will be the fortune or doom of her people.