As it was shown in the episode "Dragon Summit" there are 13 threats to the magical world. Yet two things bug me.
1. There are 13, but so far, we've only seen 7 (The DD, The Huntsman, Kraken, Krylock, Hobgoblins, Chimera and Kelpie). Who are the other 6?
2. If these creatures are all so dangerous, then why are they allowed to run amok?