The Moonshadow harp is a key item in Dragon Quest VIII: Journey of the Cursed King.
As they look around for information, Marcello and Brains (from Pickham) mention to them that the harp is likely in the Castle of Ascantha. Upon arriving there, King Pavan informs the party that the harp is indeed in the castle as it is a family treasure, but is grateful for their help from before. He leads the party to the treasury, only to find that all possessions were stolen, with a tunnel having been dug under the castle.
|A royal treasure from Ascantha that contains some sort of mysterious power.|