Article: Once you have the Boss Key, return to the main room. Fill the temple completely with water, then move around until you notice a statue with a Hookshot target on it. Use your Longshot to latch onto it and access the door behind it. You will find yourself in a room with a steep slope and a Boss door at the end. Walk up the slope, avoiding the blades that slide across the room. Inside the Boss door is Morpha, the Boss of the Water Temple. Morpha is the evil monster hoarding all of Lake Hylia's water. It can manipulate all water it touches, making it a frightening opponent. To emerge victorious, use the following tips:  Pull Morpha's nucleus close to you with the Longshot, then hit it with your sword. Stay off the islands and use the perimeter of the room. Morpha's reach is limited, and you can use that to your advantage. Don't try to handle Morpha underwater! You won't be able to use your sword underwater, so stick to the surface. Once you have destroyed Morpha, grab your Heart Container and exit through the portal. Congratulations! You have finally beaten the difficult and annoying Water Temple! When you enter the Sacred Realm, you will learn that the Water Sage is Princess Ruto herself. She will award you the Water Medallion and assure you that Princess Zelda is safe.
What is a summary of what this article is about?
Locate Morpha. Fight Morpha. Collect your Heart Container. Get your Water Medallion.