Board Thread:Grimm News/@comment-3125844-20150616211415/@comment-26235944-20150715050051

Grimmaniac wrote:

As for the keys, I don't think the producers introduced that storyline with no idea of where they would go with it. I would encourage people to check out the Seven Keys page; there were a couple possibilities mentioned by Renard of what the keys might lead to, so that's some evidence right there that there is at least a couple ideas the producers/writers had early on in the show with what the significance of the keys were. Yep, as I recall it was... So it's easy to see why they said they are "still figuring it out"...because they probably have tossed around a lot of different ideas. They've already given us four of them, but there could be a lot more.
 * Secret of everlasting life.
 * Mohammed's sword, which supposedly has powers.
 * Nails from the Cross, maybe even pieces of the Cross, which are said to have powers.
 * Secret of alchemy. [I had to go look this one up, because I had forgotten the 4th one. Heh.]