Falls Basin

Upon entering the only place you can go is in the top left corner. Fight the bad guy and go through the door here. You'll need to have positioned the first pillar like so.



Jump across the gap. Now go down to fight the bad guy.

Climb down the stairs and go fight the Lamias. Push the second pillar to this location.



Jump across. Then go down the stairs here. After fighting the Lamias push the second and third pillars to this spot.

Jump across and fight the bad guys. Then head up the stairs and through the top door. You'll find a box with 10 Explosives. Now go through the lower door.

You'll need to go back and move the first pillar here.



Jump across and you can finally get the chest that contains the Heal spell.

Now you'll need to fight the Snow Crab.

The Snow Crab is weak to the Axe so make sure Knight attacks with it instead of his other weapons. Phoebe can use her regular attacks. Keep attacking and heal when necessary and you should finish the battle easily.

After fighting the boss Phoebe teaches you how to use Jumbo Bomb (it pretty much upgrades the power of your explosives). Use this to open the wall. This door takes you to the other side of Falls Basin. Your next destination is the Ice Pyramid.