"Warhammer: Legions Imperialis - A Fresh Take on the Horus Heresy"

Games Workshop's decision to set the Legions Imperialis game in the Horus Heresy era instead of the current 40k timeline can be attributed to both lore and production reasons. Lore-wise, the Horus Heresy offers a larger scale of devastation, allowing for the use of massive armies and Titans. Production-wise, focusing on the Horus Heresy allows GW to support multiple armies with just one kit, simplifying production and inventory management. Additionally, it avoids the need to produce Xenos models and prevents cannibalization of their existing player base and resources. While the lack of Xenos models may disappoint some players, there is a possibility of expansion in the future. Ultimately, GW believes that the Horus Heresy is the safest play for launching a new game.