Kingdom Under Fire II merges real-time strategy (RTS), role-playing game (RPG) and massively multiplayer online game (MMO) genres - the game is to have a single player, and online multiplayer mode. The game follows on chronologically from Kingdom Under Fire: Circle of Doom, and is the first RTS game set in the Kingdom Under Fire universe to be released since the 2005 Kingdom Under Fire: Heroes.

The game was announced in January 2008, and has been subject to delay and changes to release platforms; A closed beta-test began in December 2011 in South Korea.

In November 2013, the developers announced that a version for the PlayStation 4 was in development.