You may obtain a new Moonshade Earring by tossing your current one and checking the ??? next to the Veridical Conflux in Grauberg. This will reset your current WotG mission to Maiden of the Dusk where you will have to redo the fight and obtain the Moonshade Earring along with all cutscenes.
So it was that Altana's grief was ended, tears marring Her divine countenance no more. Yet the Crystal War rages on. Ever must you carry on the fight, in honor of she who sacrificed all, that others might know peace...