The thing is that Warcraft has so much story available to it. For the fans, there are some key stories they really want to see on screen. I won't be doing those.

You have to be flexible enough to realize that, over the course of making a film for three and a half years, things are going to slightly change and drift, as you work out solutions to each problem as they come up.

When we first made this whole idea this was going to be calling card film [Moon] and it was going to give the opportunity to make my first feature film. But it turned out a lot better, we just couldn't stop ourselves from going into it, and we are very proud that it turned into something that people wanted to see.

One of the things I think is unique and signature about Blizzard is that whenever they do their games, and with Warcraft in particular, they take the things they love and put a twist on it. They showed that heroes can come from the most unexpected places, and as a player, you can play as a hero, on all sides.

One of the biggest changes for me on a practical level of shooting the film was having a second unit.

The beauty of science fiction is its open canvas. You can hypothesize about any element of the world. It doesn't have to be laser battles and things exploding, you can be JG Ballad and maybe just change one little thing about the real world and that becomes science fiction.

I've worked really hard to build up a career on my own. I turned 30 recently and it took me a long time to get the chance to make a feature film and do it on my own terms.