A square fortress of stone appears from the ground at an area you can see. The area must be 120 ფუტი on each side and not have any buildings or other structures in it. Creatures in the area are harmlessly lifted.
The fortress has four turrets with square bases that are 20 ფუტი wide and 30 ფუტი tall. There is one turret on each corner. The turrets are connected by 80-feet-long stone walls that are 1 ფუტი thick and made of panels that are 10 ფუტი wide and 20 ფუტი tall. You can place up to four doors on the outer wall.
A square keep, 50 ფუტი on each side with three 10-foot-high floors, is in the center of the fortress. The floors can have as many rooms as desired, but each one must be at least 5 ფუტი on each side. Rooms can be connected by doors or archways and have whatever furniture desired. The keep also has food to serve a nine-course meal to 100 people each დღე. If objects in the keep are taken outside the fortress, they become dust. The keep's floors are connected by staircases. Each wall of the keep is 6 inches thick.
100 invisible servants come with the fortress and can be commanded by creatures you pick when you cast the spell. The servants act as though made by Unseen Servant.
Each 10x10ft section of the fortress has 30 hit points and 15 AC per inch of thickness, and is immune to poison and psychic damage. If a section is reduced to 0 hit points, it's destroyed, and the DM may rule other sections collapse as well.
If the spell is cast elsewhere or 7 დღე pass, the fortress sinks back into the ground. Creatures inside it are harmlessly set on the ground. Casting this spell every 7 დღე for a year makes the fortress permanent.