Note: you don't have to reverse the Mini state as you'll go through another dungeon that requires the Mini state.
From the Tozus Tunnel, head northwest; you'll see the cave.
- Vikings' Cove, B1: collect the chest hidden behind the wall in the corner.
- Enter the next floor, B2, and collect more treasures.
- Go to the room in the bottom-right corner, then talk to the captain.
- Leave the cove using the top-right exit.
Chests/Items:
- C-060: 300 gil - B2, hidden behind the wall.
- C-061: 300 gil - B1 -> B2, top chest.
- C-062: 300 gil - B1 -> B2, bottom chest.
- C-063: Thundara - B1, hidden area, right chest.
- C-064: Fira - B1, hidden area, middle chest.
- C-065: Blizzara - B1, hidden area, left chest.
Give these 3 tier-2 elemental magic to your main Black Mage.