@smurf6 if you have already been to 200AF it will be unlocked in the Historia Crux.. press the start button and click the top one "return to Historia Crux' and look around and you will find it.

@shademalkovich There is more than 1 Oerba. there is 200AF, 300AF & 400AF. Not unlocked them all yet but you must be able to reach the water in 300 or 400AF

Also how to you get to the other side? there is usually a Chocobo to help but i can't find one you can ride. where treasures 14,15,16 and 21 are.

@calacake not sure about that it worked fine with me the other day. did you fight it when the weather was changed to Lightning?

@LiFERACE Go to The Void Beyond and travel through the space distortion. it's orange i thing on the top of the stairs ti the East.