When you find Negulmur in the Stillshrim of Miriam, in that same area if you are facing south toward the GIANT statue that you had to make the sword move. The west wall just opened up to a staircase that leads to a secret area where I got a shell shield. Has anyone else found this, I searched the forum but couldn't find it anywhere. Cool freebie though if you can get the wall to open. I'm at lvl 99 across, just finishing up the marks and espers before bahamut, so it's kinda worthless, but find it early in the game and it'll help.