Maybe I got #5 and #6 wrong. Apparently there's two new difficulties in Element Quest: Ultimate+ for 50 AP, and Ragnarok which is available once a day for 90 AP.

Apparently these were a thing ever since Nandi came up, but nobody told me. I don't even know if these are perm or only for the event, but uh, they're here! Just as a guess, Ultimate+ is one guaranteed Fang drop and Ragnarok is five guaranteed Fang Drops. Too bad I'm done with the Fang farm already, so sucks to be me.