Protects a World Wonder village by increasing its defensive strength.
Requirements: World Wonder village

Note:
For detailed costs, bonuses, and requirements of all buildings and resource fields, you can use this Building upgrade calculator.
The Natarian Wall is a special defensive structure that can only be built in a World Wonder village.
Like other walls, it increases both the village's base defence and the defensive strength of stationed troops. Each upgrade further improves these defensive bonuses.
The Natarian Wall is exclusive to World Wonder villages and replaces the tribe-specific walls found in regular settlements. For more information about World Wonder villages, see Wonder of the World.