Location : You remember how you had to get the Sun Sigil, right? Go to the Calm Lands, speak with the Chocobo Lady, train a Chocobo if necessary, then race her and try to get a negative time? Basically, if you’ve done that, you’ve already done the main part of this quest - if not, you simply need to beat her in regards to your time. It need not be negative, but having the Sun Sigil signifies that you’re already okay. Anyhow, in the northern part of the Calm Lands, run from west to east along the northern border to find a small hidden path to this weapon.