Glittering Stone, book 3 : Water Sleeps
Glen Cook1999

Regrouping in Taglios, the surviving members of the Black Company are determined to free their fellow warriors held in stasis beneath the glittering pain. Journeying there under terrible conditions, they arrive just in time for a magical conflagration in which the bones of the world will be revealed, the history of the Black Company unveiled, and new worlds gained and lost... all at a terrible price.