During a video Q&A session, Creative Assembly announced that Total War: Warhammer III's Immortal Empires mode beta test
“Immortal Empires” will combine maps and factions from all three games in the series. The developers will continue to refine the modes over the course of several years. The first improvements will be released from October to December.
Access to “beta” owners of all parts of Total War: Warhammer will receive.
Details about the modes are periodically published by the authors on the franchise blog. For example, one of the last articles is devoted to starting positions.