The actor, who plays Thorin Oakenshield in the movies, directed by Peter Jackson, feels emotional about Middle Earth possibly being shown on the big screen for the last time after the 'Lord of the Rings' and 'The Hobbit' movies are complete.
He told BANG Showbiz :" It will be 15 years of Peter Jackson's work, there'll be six movies to watch, but it could be the final time. There's something moving about that.
It'll be a shorter film and you'll get to hear the end of the tale that Tolkien wrote.
"I can tell you nothing about the Battle of the Five Armies other than it cost me some blood and some tears.
"I think it's a testament to Peter Jackson's casting that the actors that come together to work on a movie with him do naturally develop a fellowship."
The 42-year-old actor claims it was a "bit of an endurance test" for the cast involved but it helped them to bond and he was thrilled to be able to work with Sir Ian Holm, who will reprise the role of the senior Bilbo Baggins in the movie.
Richard continued: "[It] was a lot of fun - he's a very naughty, entertaining man!
"It [the film] took me away to New Zealand for 18 months, which was a bit of a change.
"I was introduced to some incredible people; I was made to feel like one of the family. The time we were afforded to shoot made me work in a different way.
"I was gifted the sword at the end of the shoot, which is incredibly heavy and really rather beautifully made, so I'm very proud of it. I'm very proud of my sword."