Wintry Cave

Upon entering, the box to the left contains 10 Explosives. Then go right. Now go up and left.

As you go down and left along the path you'll fall down the slope. Phoebe will teach you how to use the claw to save yourself from falls. You can also use it to climb. Now go right and climb up the wall to get a chest with 3 Heal Potions.

Now go back to the lower level and take the left path up. Then climb over and down.

Then continue climbing up to where you fell. Go left and take the stairs up. The box at the top right corner has 3 Cure potions.

The chests at the top contain 10 Arrows and 3 Cure Potions. Now go back to the other room. At the far left climb over and drop to the far path.

Down and to the right is a box with 3 Refreshers. Then go left. Climb over and fall down to the lower level. Go left and climb up the left side of the room.

Blast open the door at the top of the room to get to the second floor. The chests right inside this room contain 10 Arrows and 3 Cure Potions.

Up and down to the right are more chests. They hold 10 Arrows and 3 Heal Potions.

Now take the stairs down at the top of the area. The chest here contains 10 Arrows. Then go fight the boss.

The Squidite is strong against Earth attacks so avoid using that spell. You should use Thunder and Bombs. When Phoebe runs out of Thunder use her regular attack. Just attack and cure as needed and this boss should go down easily.

In the chest you'll find the Libra Crest. You'll need to take it to the Libra Temple to activate the teleporter.