Europa Barbarorum is a modification of Rome: Total War based on the desire to provide RTW players with a more fun, challenging, realistic, and historically accurate game experience. Europa Barbarorum is a total conversion, though it covers roughly the same time period as the imperial campaign included with RTW. The modification affects all areas of RTW; all vanilla units have been removed, all new models and textures, a new economic system, new traits system, new scripts, and in general new gameplay. No area of RTW is left untouched.
The detail and breadth of the mod is incredible. I don't even have to think abut Rome II because I can play EB. I played as Rome in EB for 18 months and still was not the slightest bit bored. It is a fantastic and beautiful mod. Thanks to the modders!