Four Horsemen Universe is a 38-book series with 38 released primary works first released in 2016 with contributions by Mark Wandrey, Chris Kennedy, Terry Mixon, Doug Dandridge, Jason Córdova, Kevin Ikenberry, Kacey Ezell, Jon Del Arroz, Brad R. Torgersen, Christopher G. Nuttall, P.P. Corcoran, Christopher Woods, Tim C. Taylor, Peter Cawdron, Scott Moon, Josh Hayes, Rob Howell, J.R. Handley, Corey Truax, Terry Maggert, Kal Spriggs, T. Allen Diaz, Stephanie Osborn, Chris Smith, Marisa Wolf, Robert E. Hampson, Kevin O. McLaughlin, Jake Bible, Michael J. Allen, Jon R. Osborne, Paul Elard Cooley, Joseph Capdepon, Thomas A. Mays, Jamie Ibson, Lee Dunning, Sandra L. Medlock, Kevin Steverson, Quincy J. Allen, Zane Voss, Richard Alan Chandler, Jon R, Osborne, Dan Bridgewater, William Alan Webb, Casey Moores, Alex Rath, Qunicy J. Allen, Matt Novotny, Mark Stallings, Peter J Aldin, Marie Whittaker, Mark Stallings, Eric S. Brown, and Jason Brannon.