Go to Mysidia. It is west of The Great Hole. (The one that takes you to the Underworld/Overworld). Hey, look at that. It's the Legend. Look at all the pretty colors! The Big Whale!! Now, go back to the underground smithy. I (Excalibur) am done! Great sword, man!! Go back to The Big Whale. It's got a Fat Chocobo and beds. Yes!! Talk to the crystal in the middle. And we're off to the moon!!