i think the fortification building needs a little bit of work. it should be able to compete with the walls of babylon, which gets a little more defense (+2.5 as opposed to +2) and a pretty deep discount, unless they nerfed that or something. obvious solutions to this are even more extra defense or, like the dun in civilization 4, granting a promotion, most likely drill i. i think the more interesting of these 2 alternatives is the second, since it would probably make an often ignored building more likely to be built, but like i already said, they did that last game. also, dun is a little more exotic of a name so i think it sounds a little better, but what the building is called is less important than what it does.