Board Thread:Off Topic/@comment-29191679-20161005183228/@comment-29191679-20161007175158

So you might notice, there are 5 Mythical Keys.


 * The first one is the original X Star, the Light Key.


 * The second and third keys are unnamed so far, but the requirements for getting them are encoded.
 * The second key is, as stated before, obtainable from the Elder Guardians in the Ocean Monument. This key is a prerequisite to the third key, as the X Star will only then allow you access to a secret dimension where you can find and craft the next key.


 * The fourth key is obtainable from the new Quests that are available right now. You need to finish all 10 to unlock it.
 * The final key is encoded as well.