
To get The ohmighty Legendary Sword you must have the Power Glove given to you by Jess. Then you need to die and use the quick restart feature around 16 times. After doing all that head for the statue of King Snow wich is east of Inoa Village and use the power glove to lift the large rock blocking your way to that statue.walk up to it and King Snow will fell pity for you and give you this weapon. Even though it doesnt have a charge attack it is still the strongest weapon in the game.
After completeing alot of quests, go back to the Inoa mine and there is a house by the stream.Go inside and up the stairs to talk to the ohmighty composer Rohei.After talking to him he will let you listen to his music wich is the games background music!