Read this: The story focuses on series protagonist Link, who tries to prevent Hyrule from being engulfed by a corrupted parallel dimension known as the Twilight Realm. To do so, he takes the form of both a Hylian and a wolf, and is assisted by a mysterious creature named Midna. The game takes place hundreds of years after Ocarina of Time and Majora's Mask, in an alternate timeline from The Wind Waker.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What land does Ocarina serve to protect?
unanswerable