Charging at full speed with a large body to break through a wall of water (Curly, Devil, or Manticore).
The area accessible by travelling through water (Scula).
Some spaces within the castle connect to different locations.
Being able to stand on water and jump.
Being able to jump further by slowing your rate of descent.
She will also give you hints on what is needed to proceed past some obstacle or puzzle. When you talk to her, you will be healed back to full health. The entrance is the first room in the game.