* "The Raven, Nevermore" is a repeatable quest. Please note, however, that the quest reward can only be obtained the first time round.
* Completing the sidequest "Living on a Prayer" unlocks both "Rivenroad" and "Rivenroad (Hard)" repeatable battles. Please note, however, that no further reward will be issued for completing the former.
I don't know if anyone asked, but does this mean you can only pick one item when you beat him like FFXI earring/rings.