Great Wall (Zoroaster)

A great wall separates two territories, creating an almost impenetrabel barrier between them. It can be sued to seal of a mountain pass, or several great walls can be used to form a continous barrier.

It takes a siege to penetrate a great wall.

The great wall is topped by a road and also provides the benefits of an Elevated Road, but unlike an elevated road it continues to function until taken through siege.