[Kransha]

Well, generally, Melkor/Sauron's evils have been extinguished. Orcs linger in the Misty Mountains, some orcs may remain around Nurn, there are always a few bothersome trolls, Haradrim, Easterling, and Dunlending rogues. Various villains to be dealt with, but no really great evil. Eomer and Elessar rode out in the 4th Age to quell those evils, though many of these exploits are yet undocumented.

Actually, there are two loopholes. Firstly, the forgotten 'Citadel' of Gundabad, the orcish stronghold in the Misty Mountains, which survived the War of the Ring and must be thwarted. Secondly, the slim (very slim) possibility that there are lesser dragons or the 'worms' of the east that are sparsely mentioned. This is, of course, nary more than heresay and conjecture.

For an illustration of possibilities, look to The New Shadow, the barely satiating first chapter of a possible sequel, written by Prof. T. himself. For good reason, JRRT gave up on this, seeing it to be pointless to explore man's weakness, since the Third Age Myth for Britain was already complete. Man's weakness would be nothing but a weak allegory for the Medieval world, not fantasy in any respect and not really Tolkein quality.

In that brief glimpse, we are only introduced to preliminary characters, one being Borleas, son of our RotK friend Bergil (or was it Beregond?). It is unsure whether he was meant to be the protagonist, and the story only falters, despite the usual Tolkein flourish of the writing. It is shown that all evils will arise when man's world succumbs to generic corruption, like the abovementioned cults, etc.