Well, if you want to know, I guess I'll tell you x-x
------SPOILER ALERT FOR OTHERS!-------------
After the water temple in Lanayru Province, you go back to visit the light god, who has now regained his power and light has been restored to that area of Hyrule. When you are there, the god is speaking with you, telling you of the twilight and darkness that cursed the land. Suddenly, Zant appears and not harms the light god again but tries to take his power, though, Midna tries to stand up and stop him but he blast Midna with the light power that he had possessed from the god, making her weak and injured, whilst also permanently turning Link into a wolf with a shard of Twilight.
Once this cutscene has come and gone, you enter the part of the game commonly known as "Midna's Desperate Hour" where you must carry midna from Lake Hylia to Hyrule Castle to see Zelda because she is the only one that can revive her.