The mod radically changes all the basic aspects of the game. For a start, all the different factions of the game are now divided into the North, the Vale, Dorne, the Iron Islands, Pentos, Braavos, etc. There are a total of 18 completely unique factions that each has its own unit, weapons, armor, insignia, and all the other details you'd expect to be included.
The map, of course, has also been adapted to look like the Lands of Westeros. That is, all the important geographical features of Game of Thrones, such as the Twins, the Desert of Dorne, or the Eagles' Nest, are perfectly represented in the videogame.
A Clash of Kings, as its name indicates, is set in exactly the same moment as the second book. This means we can change the course of the events that happen later with our decisions in battle.
A Clash of Kings is one of the best mods out there for Mount & Blade, Warband, a game that itself has one of the biggest and best communities of modders. A real treat for fans of the Song of Ice and Fire books and the Game of Thrones series.
You must have Mount & Blade: Warband already installed.