Talic's Skycastle

As part of preparing this spell, you must have fully overseen the construction of the targeted structure or walked every inch of it, every day, for at least one consecutive month. This structure also can have no larger than 125 feet on each side. The ground under the structure becomes the base which cannot be any thinner that 20 feet, but no thicker than 60.

Once you set up the orb on the pedestal in the desired room an cast the spell, the two objects fuse together, and to the floor, causing a structure and the ground beneath it to lift into the air. Once airborne, you can control the speed of the castle, but no more than 30 feet (3 mph) and turning no more than 90 degrees in any direction in a round, as long as you are touching the crystal orb.

While touching the orb, you can give the orb a command to go to a location you know well or visited before. You can also use an action to allow a target creature that you can see to control the structure. Only one creature can be targeted and ends if another creature is targeted this way.

If I cast the spell again on the same location using an orb attuned to a different plane of existence of the same crystal sphere, the orbs magically combine. As an action, you can touch the orb and choose one of the attuned planes to cause the structure to teleport to the selected plane over the next minute. Once you do this, the structure cannot do so again for 24 hours.

You can also use an orb attuned to another crystal sphere's material plane. If you do so, the sphere floats above the pedestal. As an action, you can touch an orb causing it to replace the one currently on the pedestal, which replaces the selected one, and the structure to shift to the selected crystal sphere's material plane over the next hour. Once you do this, the structure cannot do so again for 24 hours.

The base of the structure has 1,000 hit points, is immune to poison and psychic damage and all conditions, and resistant to all other forms of non-magical damage. It regains 100 hit points every 24 hours, provided you are in the structure and no damage has been dealt to it during that time. If the base reaches 0 hit points, the structure is destroyed and the ruins fall to the ground. Additionally, the structure gains resistance to all damage it isn't immune to.

Dispel magic cannot dispel this enchantment, unless it is cast at 9th level and targeting the crystal orb. Due to the power of the spell, it takes time for the enchantment to fade. Once dispelled, if the structure is in the air, it stops and falls 20 feet in the first round, from round 2 through 5, it begins to fall 100 feet per round, and goes into free fall after that. If the structure is in free fall for more than two rounds, the structure is automatically destroyed and all creatures within, or under, the structure are instantly killed.