The mod is about Europe in the year 1257 so it's a historical map with historical factions. Other than that the game has improvements to pretty much everything.
Here is a list of some of the features:
-All of Europe, featuring 42 factions
-Hundred of new historical, region based troops.
-More then a thousand new items, armors, weapons, all historically accurate for XIII century.
-Buildable castles.
-Manor system, with the ability to build custom settlements.
-Realistic combat system, with taunts, formations, improved horse archer skirmishing scripts and other features.
-Custom battle scenes, realistically depicting each region of Europe.
-Weather system, including desert storms, blizzards, rain storms.
-Play as one of your soldiers after your death, with our made auxiliary player feature (can be turned off in the mod options).
-Cruading system: Join a crusade or start one yourself!
-Join a crusader order as sergeant or a knight!
-New lance recruitment system, aiming to emulate medieval feudal recruitment system.
-Companion system improved and remade.
-Sea battles and sea travel.
-Many new scenes for castles, towns and villages. A good number of them - are historically based reconstructions of real places!
-Graphical improvements.
-Many other minor and major features!