Sid Meier's Civilization VI: Byzantium Gaul Pack enhances the strategy game by introducing two new civilizations: Byzantium and Gaul. Players can now lead the Byzantine Empire under Basil II, utilizing unique units like the Dromon Ship and Tagma to combine religious influence with military strength. The pack also features Ambiorix as the leader of Gaul, where players can leverage their military flexibility and cultural production through the unique Oppidum district.

This content pack not only enriches the gameplay experience by adding new strategic elements but also expands the historical narrative with these two distinct civilizations. The integration of these new leaders and their unique abilities offers players fresh tactics and challenges, making it a valuable addition for fans of the franchise.