Like the title character of last year's The Hobbit: The Desolation of Smaug himself, Peter Jackson's big-screen adaptation of Tolkien's 320-page tale was itself a bit of a dragon: three films, nearly two decades from conception, and more than a half-billion dollars in the making. And now it is coming to a close with The Hobbit: The Battle of the Five Armies. ''I've been doing this for a long while, but there's no time for nostalgia yet,'' says Jackson. ''We've still got a lot of work to do.'' Jackson and his special-effects crew at Weta are burning the midnight oil to finish the final installment, easily the most ambitious of the trilogy. Jackson insists that he won't lose his heroes' personal journey amid the bombast. ''We definitely have big emotional moments in this,'' he says. ''So hopefully we'll get you crying again with this one.''