Sometimes, it may look like we've cleaned house on all possible threats. The Lich King is dead, leaving the Scourge in disarray, the Legion was driven off, Deathwing is dead and the Aspects are out of a job. With the fall of Garrosh Hellscream's 'True Horde' on the horizon, we'll have dealt with the Sha and put paid to the legacy of yet another Old God. We're good, right?
Of course not. It would be silly to think that. Some of those threats I just mentioned are still, in fact, lurking around the corner. And there's plenty of other squamous monstrosities and terrible dangers lurking out there, ready to step up and take center stage and force not so reluctant adventurers to get their swords, spells or other implements of destruction ready. Azeroth, as has been pointed out, is a tiny oasis surrounded by perils.
So let's take some time and look at just what remains out there to potentially kill us, or enslave us, or eat our souls, or some variation of same. Who's left? Not all of these contenders have been hostile to us so far, but past neutrality or even friendliness is no guarantee of the future. Also, these are in no particular order - it's not a top ten list, it's a however many occur to me list.