It relates into several existing ones: create demiplane and resplendent mansion, mostly. It's intended to make persistent (as with demiplanes) mage towers which can be moved relatively effortlessly between locations (as with the resplendent mansion).
Align demiplane
School: Conjuration; Level: Sorcerer/Wizard 9, Witch 9
Casting Time: 10 minutes
Components: V, S, F (specific demiplane key)
Range: Long
Target, Effect, Area: See text
Duration: 1 day / level
Saving throw: None
Spell resistance: No (harmless)
This spell anchors a demiplane temporarily to a location on another plane, creating a boundary zone such that the outer edges of the demiplane all lead onto the host plane. The area of the host plane thus occupied by the demiplane becomes inaccessible for the duration, during which it cannot be affected in any manner and during which no time passes for it. Should this area contain anything other than mundane terrain, the spell automatically fails - this spell cannot be used as an offensive weapon in any way.
Before this spell can be employed, the caster must have access to a demiplane, this requirement would typically be met by creating one using castings of the Create Demiplane line of spells, along with Permanency as necessary. The resulting demiplane key // plane shift "tuning fork" can then be used as focus for the present spell.
The typical use of this spell is to make a demiplane act as a temporary real-world location. Demiplane islands can be placed into lakes, seas or oceans, demiplane towers or fortresses called up from mountaintops or plains, demiplane oases placed onto desert dunes, and demiplane caves made to open from tunnel complexes or mountainsides.
The demiplane remains a separate plane, retaining all planar properties, and remaining another plane for the purpose of adjudicating plane shift, scrying or teleportation effects. However, all points in the demiplane gains lines of sight and effect onto the parent plane in all direction, unless where blocked by walls or other physical obstacles.
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Cool idea. It's an easy way for a strange tower to appear over night or something.
I would add language that makes it only possible with a demiplane that the caster created. It'll simplify this being used to move other peoples demiplanes.
Also, I'd have the permanency for this be separate from the Demiplane permanency. This includes cost. Just add a line a the bottom. "This spell can be made permanent..." Then you'll want to add that if the demiplane spell ends for whatever reason so too does Align Demiplane regardless if Align is permanent or not. However, if align ends and Demiplane does not then it simply goes back to being accessible only by planeshift, etc.
I'd make the casting time the same as the create greater demiplane spell.