According to Donald, "When we put together the pitch for Darksiders 1, we wanted it to be multiplayer then. It's just too much work when you're starting a brand new studio with a new intellectual property and you're building your own technology. We're also evolving the series into more of (a role-playing game), which was something else we wanted to do from the beginning, but we just didn't have the resources or time or money to do it the first time around and do it justice."
"Of course there's balancing with the different abilities," Donald added. "We're going to want them to play differently, so we wanted to spend some time developing each of the characters individually."
Darksiders followed the story of War, while Darksiders II will be focused on Death. Darksiders III hopefully will include all four Horsemen.