The game was originally announced in January 2008 to be published on PC and console platforms in 2009. The game was to explore the wars between three factions: the Human Alliance, Dark Legion, and Encablossians in their struggle for control of the game's world, the continent of Bersia. The game's events continued the story of the Kingdom Under Fire universe, 150 years after Kingdom Under Fire: The Crusaders, and introduce a new faction – the 'Encablossians', who have been brought from the Encablossan dimension by Regnier, an antagonist in previous games. The plot of Kingdom Under Fire II came chronologically after the events in Circle of Doom – which took place within the alternative dimension of the game's antagonist – Encablossa. When controlling other units, the game played like a typical RTS cannons for example could be used to break down castle walls and spearmen could be used to protect troops from cavalry.

The player had full control of their character and could run around freely with their troops following them. The player was to control a hero who could command various troops. The game combined action RPG with real-time strategy. On Septemit was announced that the English version of the game's servers would be closed on October 26, 2021. Kingdom under Fire II was published in mid November 2019. In July Taiwanese version entered an Open Beta. The Chinese version of Kingdom Under Fire 2 entered a no-wipe Closed Beta state in March 2017. However, in November 2019, development plans had ultimately been scrapped. In November 2013, the developers announced plans for a PlayStation 4 version.

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. Due to its mass cancellation, most of the 4 platforms were scrapped, and it was Windows-exclusive. The game followed on chronologically from Kingdom Under Fire: Circle of Doom, and was the first RTS game set in the Kingdom Under Fire universe to be released since the 2005 Kingdom Under Fire: Heroes. The game had a single-player and an online multiplayer mode. Kingdom Under Fire II was a video game set in a high fantasy setting developed by Blueside which merged real-time strategy (RTS), role-playing game (RPG) and massively multiplayer online game (MMO) genres.

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