Civilization VI reveals more details on Ambiorix and Gaul

Gaul’s “Hallstatt Culture” ability allows Mines to provide a minor adjacency bonus for all districts, Culture Bomb unowned territory and grant additional Culture. Specialty districts cannot be built next to the City Center and do not receive adjacency from other districts. Ambiorix’s unique ability is the “King of the Eburones,” where he gains additional Culture based on unit cost when a non-civilian is trained. Melee, anti-cavalry, and ranged units receive bonus Combat Strength for every adjacent combat unit. The Gaesatae unique unit replaces the Warrior; it is more expensive to train but receives additional Combat Strength when fighting stronger units and district defenses. His unique district is the Oppidum, which is cheaper and available earlier than the Industrial Zone and unlocks the Apprenticeship technology when constructed. It is defensible, offering its own ranged attack, and receives a major adjacency bonus from Quarries and strategic resources.