Holy book in Black Library in Stonehell (3B-29)
Taking a look at the book that Xan brought back from Stonehell, it seems to be some kind of story of an entity known as Dzzhali, sometimes referred to as The Strangled Bride. It's difficult to follow and very disjointed, but seems to tell how Dzzhali was betrayed by her husband, and threw strength of will alone threw her soul into the Well of Chaos rather than drift into the underworld.
As Xan reads the book, he almost hears the words being read aloud in his mind by a deep voice, possibly that of a woman's.