The long night - Fantasy/Game of thrones-like : A ice age has hit Europe, forcing many northern regions besides britania to be abandoned as everyone tries to get south to fertile climates. The Danes from that 1st incursion had been gifted most of Northumbria and named the land Danelaw. Viking Age - Most Modern setting: AoC DLC set just after the initial viking incursions on Britain.
Warring States - Roman civil war : splits western empire into 7 factions that are at odds with each other and has a heavy focus on the Roman auxiliary system allowing a high variety of units for each roster.
adds more playable Hordes and minor factions, keeps play style close to vanilla Imperium - Best complete mod - splits eastern and western roman empires into sub factions that are allied together.