This stronghold was made to protect the treasure in the keep at the top of the castle. To keep it safe I have made a very strategically designed base. It is made of 4 pillars that connect in a spiral up to the top. Because of this the defenders would have a height advantage. Also they would be able to throw objects down but an attacker would not be able to throw it back because of gravity.
These are two pictures of the design of the lower part of the castle. As you can see, it would be fairly difficult to siege.
This is the keep at the top surrounded by guards.
Inside this keep there is a lot of treasure.
Also in my pictures there is a battle going on. Take a look.