"Well... I've never done them, obviously. Because failing them means death. But they're tree Trials; Body, Mind, and Spirit. You enter into three different caves, and return with a treasure inside, to prove you succeeded. Any Fae who succeeds is promoted by the Queen to the High Court, and any mortal that succeeds becomes her Champion. There's always someone who tries every few year, and ends up getting killed for the trouble. Usually mortals."