As I stated, the prayer was etched onto a golden tablet. One of these idol worshipping scoundrels must have it on their person.
If you do recover my prayer, take it to Astarii Starseeker in Darnassus. It matters little that my faith has been rekindled after the countless malevolent actions that I have taken against this world and its inhabitants, but my prayer must be heard. Absolution is the last thing I expect.