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It's essentially been redubbed the Immortal Empires for Total War: Warhammer 3. In Total War: Warhammer 2, this feature was called Mortal Empires. To play with the DLC factions from those games, you need both games and the DLC. You will also need to own them on the same platform (Steam, Epic Games, etc.) Immortal Empires mode contains a new map where all of the previous factions can fight each other. Yes, Total War: Warhammer 1 and 2 are required to play the Immortal Empires. A separate campaign map called Immortal Empires requires both older games. Players won't have access to all of the features because the Main Campaign and Immortal Empires are completely different. Players do not need to own any older games to play Total War: Warhammer 3's main campaign.
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