No new castle / fortress creation

[SEAWOOD]

I suggest that when the five castles are linked to create a fortress, that the main one becomes the fortress and then the four linked castles disappear (i.e. No new Free Castles are created). Additionally, when the five fortresses are linked, that the main one becomes the city and the others disappear and are not available anymore.

This would require strategic planning and fore thought before linking them. Also, would give strength to having castles in a local area.