Ah, well I'll have to go inactive for the next 2 weeks (Jun 1-11), so I'll just let you guys know the answer.
But from the responses I''m seeing, I'm guessing "Theme" was the wrong word for the subject. I probably should have put symbol.
Anyways, the answer was the Cross.
In the original Legend of Zelda, the Cross is present on the Shield and the Magical Shield.
The Cross was an item in the Adventure of Link. In AoL, the Cross allowed you to see invisible Moas.
And for the part that says "Faith," refer to Cooldogs_1's thread titled "Multiple Religion Theory." Going through the first post in that thread, you will eventually find a picture of Link praying in front of a Cross.
Now, I will give the next riddle to Epwna, since I can kind of see partners working into that riddle, especially Midna.
Oh yeah, North, that was too many guesses in a post, only two per post