The Fourth Age: Total War was initially released as a series of cumulative modules: Corsair Invasion, Forth Eorlingas, and The New Shadow. Another unique element of The Dominion of Men is the presence of Landmark Features across the map that act as an in-game encyclopaedia of geographical features. The mod also boasts Lordship Titles for governors and a highly sophisticated and organised trait system.

A detailed trait system also divides family members into Subcultures and then down into various Tribes or Houses, all of which have an effect on the campaign. Cultures include Dúnedain, Northmen, Barbarian, Haradrian, Elven and Dwarven, with the factions comprising the Reunited Kingdom of Gondor and Arnor, the Kingdom of Adûnabâr, the City-kingdom of Tharbad, the Kingdom of Dale, the Kingdom of Rohan, the Kingdom of Dorwinion, the Beorning Chiefdom, the Kingdom of Rhovanion, the Chiefdom of Rhûn, the Chiefdom of Norh Rhûn, the Chiefdom of Khand, the Chiefdom of Dunland, the Empire of Harad, the Principality of Harondor, and the Principality of Far Harad. The player can play as any one of 17 playable factions across a map of around 170 provinces organised into 23 different regions, each accessible province being home to either a standard settlement, a city of renown, or a permanent fort. The campaign map covers the area illustrated in the official maps of Middle-earth in The Lord of the Rings novel. The modification's campaign begins during the fourth century of the Fourth Age and is based around the theme set out by Tolkien in his work, The New Shadow as found in The Peoples of Middle-earth. Tolkien and known for its stability, innovation, balance, attention to detail, high replayability, and its faithfulness to the spirit and lore of Middle-earth as Tolkien envisioned it. The Fourth Age: Total War - The Dominion of Men is a full-conversion & fully modfoldered modification for Rome: Total War - Barbarian Invasion inspired solely by the written works of J.R.R.

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