Teetri's Magnificent Mage Tower

You conjure a physical mage tower in a space within range, which lasts for the duration. You choose how many entrances there are and where they are located. You can decide how the tower is designed such as the architecture and shape, the paint or lack of, and its size, up to a maximum of 300 feet high and a 300 square foot base. The material it is made of is determined by the physical component used to cast this spell. If the shape and architecture you choose are not physically possible through mundane means, they are through this spell, such as towers at odd, impossible angles. If there are structures within the space of the tower when you cast this spell, you can choose to let the spell fail, or you can attempt over power the structures. If the structures are magical, the spell fails automatically. Make a check using your spellcasting ability score modifier, using the following table to determine success:

Each 10 square foot section of the structure has an AC of 20, regardless of the material you make it out of, has 100 hit points, has resistance to all damage, and immunity to poison and psychic damage. You and any creature you designate when you cast the spell can enter the tower dwelling as long as the structure remains open. You can open or close any or all doors and/or windows if you are within 1 mile of the tower. While doors and windows are closed, you can choose to make them impossible to see from the outside of the tower, short of truesight.

Beyond an entrance is a magnificent foyer with numerous chambers beyond. The atmosphere is clean, fresh, and warm.

You can create any floor plan you like, but the space can’t exceed 300 cubes, each cube being 10 feet on each side. The place is furnished and decorated as you choose. It contains sufficient food to serve a nine-course banquet for up to 100 people (each day if the tower is permanent). A staff of 100 near-transparent servants attends all who enter. You decide the visual appearance of these servants and their attire, or if they are even able to be seen. They are completely obedient to your orders. Each servant can perform any task a normal human servant could perform, but they can’t attack or take any action that would directly harm another creature. Thus the servants can fetch things, clean, mend, fold clothes, light fires, serve food, pour wine, and so on. The servants can go anywhere in the mansion but can’t leave it. Furnishings and other objects created by this spell dissipate into smoke if removed from the mansion. When the spell ends, any creatures or objects left inside the extradimensional space are expelled into the open spaces nearest to the entrance.

The space also comes with all tools necessary for the process of alchemy, enchanting and the crafting of magical items, each of which is contained in a safe sub space accessible by you and creatures of your choosing. These chambers are outfitted with all equipment needed for the task, such as an anvil for making armor and weapons, or fletching station to make arrows, an alchemy table to make potions, etc,. The tower cannot provide the resources needed to make potions and craft magical items, such as elemental water for potions of healing. These rooms act as dimensional spaces similar to a bag of holding, which persists beyond the duration of the spell, and can only be accessed after casting the spell again. This allows you to keep magical crafting supplies and spell components within the tower. Should a library room be made, you can use this dimensional space similar to a bag of holding, which persists beyond the duration of the spell, and can only be accessed after casting the spell again. Only scrolls, books, tomes and other written works can be stored in this space, which includes writing materials and tools, paper and vellum, and ink.

Additionally, the tower comes outfitted with several defense measures. The inside of the tower is always under the effects of the following spells: forbiddance, guards and wards, and up to a total of one 6th-level glyph of warding per room, which contains a spell of your choosing that you have within your spellbook. The outside of the tower out to a range of 60 feet from any wall is under the effects of the antipathy/sympathy spell, determining the effect individually per creature. You can choose creatures that can become exempt from these defenses.

Lastly, the tower comes with one last defense. It is equipped with an arcane cannon. While you are within 1 mile of the tower, you can command the cannon to use one of its firing properties. While the arcane cannon requires 5 minutes to regain the ability to fire, you can refuel it faster if you are within 30 feet of the tower, allowing you to expend a 5th-level spell slot or higher to use the cannon again.

The tower can be made permanent, requiring you to cast this spell every day for a year while keeping the structure and floor plan the same every time. Once permanent, the tower's structure and floor plan cannot be changed. While in the tower, you can take 1 minute to change the appearances of any room of your choosing, or of the entire tower if desired.