There is a great calamity in my world caused by someone who sought power for power's sake. It has twisted him into a creature that no longer even resembles a Hylian any longer and can only feed on the suffering of others. My powers can only bind it for a time and keep me young so the bindings won't break. I wouldn't use them for anything else because they might be taken from me.

( Zelda pauses for a moment, unsure of how else to describe it. )

It started with dreams, prophetic ones, and then became what they are now. I could never use them for anything but their intended purpose because I'm afraid I'll doom my people. My purpose is to be a vessel.