So… guys I have an idea. What about a massive fortress like barrad dur for our evil lord?
So I have this idea:
http://i.imgur.com/RZwYb.jpgOkay this isn’t exactly the best drawing but it illustrates my plan for a massive fortress. The outermost ring of defences is comprised of an outer wall that is at least 50 feet thick. This wall is punctuated by towers of which there are approximately 52. Every fourth tower is a gatehouse, which also connect via a thick wall to the larger tower at the back of the defence triangle.
Next is the middle defence wall it is comprised mostly of triangle forts Joined by a thick wall 100 feet thick at the centre of this wall is a gatehouse which not shown. The triangle forts are comprised of three large towers connected by a thick wall at the centre is a tall tower of which I think wizards could fire down from. These towers are meant to defend the gate houses as they will hopefully be the only way through these defences and to get to them the enemy must go through heavily protected corridors surrounded by high walls and towers which can rain down arrows.
Behind these is a very thick wall it is more of a giant building and a solid fortification filled with catacombs and barracks. Four massive towers watch over each quarter of the fortress. Smaller defensive towers line the walls on both sides. Finally at the centre is a massive tower that is the keep of the citadel. It is incredibly tall and is built in modules each thousand feet high topped by a ring of defences the final top piece has six magic collecting spires and two larger spires that allow teleportation of massive armies to remote locations.
http://i.imgur.com/1yavwh.jpgAs you can see by the picture the entire fortress is basically built on the levels like minas tirith. The entire fortress is not need to be built at once. The foundation needs to go all the way to the bedrock as such a massive structure will sink otherwise. The first level is basically the foundation and the outer defence walls and towers. Second-tier is a massive block of stone with tunnels dug through and then the middle defence and walls built on top. The same goes for top tier. The entire structure should be filled with rooms of every kind in order to ensure self sustainability in the event of a siege.
I have done some calculations and believe that in order to lightly garrison every single tower 162,900 people will be required and to garrison the walls a further 100,000.
outer defense towers 400 each
large outer defense towers 1000 each
middle defenses' Tfort smaller towers 800 each
middle defenses' Tfort larger towers 2000 each
inner large towers 8000 each
inner small towers 700 each
keep: 1000 per module(massive under supply of troops for this bit, only using the inter module defense rings)(oh and about 7 modules high is what i was thinking for the keep)