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Just something I've been pondering. Lets say you create a demiplane that's a small estate (main house, guest house, main garden, pond, vegetable garden, workshop, etc, etc) all fine and per the rules. However you know want to slot it into the prime material so it effectively becomes part of it. That is . . .
Previous state of affairs
House A House B
House C House D
Insertion Point
House A.House B
House C House D
Linked Plane State of affairs.
House A Plane Plane House B
Plane Plane
House C Plane Plane House D
Distance
House A (5m) Plane (600 m) Plane (5m) House B
5m (5m) (600 m) (600 m)(5m) (5 m)
(5m) Plane (600 m) Plane (5m)
House C (5m) Plane (600 m) Plane (5m) House D
So if you look between the houses you are looking at something that is bigger than the space you would think can fit. So if you look from outside between House A and House C there's only 5m between them then at the end it opens up into a 600 meter estate. If your on the estate and looking out House A is at one end of the estate and House C at the other but if you walk out between them there'll suddenly only be 5 meters between them.
Looking ->
House A Plane
5m 600m
House C Plane
Looking <-
House A Plane
600 m 600 m
House C Plane
Could this be doable do you think?
That's actually easy.
1. The cost:
- Access to the spells Permanency and Create Greater Demiplane.
- Four separate uninterrupted 6-hour periods, plus four uninterrupted 2-round periods.
- Ninety thousand gold. Casting permanency on a 9th level spell isn't cheap, you know.
2. The method:
- At the "back" of each 5-meter gap between houses, we're going to be installing a Portal feature linking to our demiplane. The Portal feature acts in all ways as a Gate spell, and as such will supply the weird visual effect you're going for when looking "into" the demiplane. That's all we need to do on the Material Plane side.
- On our demiplane, we place copies of the houses in the corners, and place our portals at the "front" of the each gap between houses - that is, farther away.
3. The size caveat:
At L18, four castings will create 1440 cubes - 4 short of making a 380' square (as sqrt(1444) = 38.) You need 10 castings to get the 3600 cubes needed to make a 600' square - and thus 225k gold for the permanencies - and even then, that's in feet, not meters. Of course, more castings = more feature options, so that might not be so bad. Just four of them have to be Portal for your needs.
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Thanks for the detailed response and if need be I'll go with that. However I was thinking all sides think Grimmald place 12 from harry potter where you basically push the adjoining houess aside to make room for the plane so its a demiplane on the prime material as it were. The difference between this
House Plane House
and
House Portal House
Plane
If you see what I mean?
I know there's a spell to move a section of the prime material onto an elemental plane what I want to do is move a demi-plane onto the prime material and engage in complex dimensional mechanics so its both there and a plane at the same time.
I was thinking like the train station in Harry Potter.
You walk toward the seam between the houses and it appears as a line that widens as you approach. The gates open as you approach. Why you need copies of the adjacent buildings is beyond me. Otherwise what Sandslice posted works fine.
To actually insert space into an existing neighborhood, would create a mapmaker's anomaly. You would be walking about 10 more squares past the now 3 houses. You would have to insert it between 2 houses, not 4, give it an address of 9999.5 street name, and answer all questions with "because, magic". You are retooling and reversing the spell that inserts livable environment into an elemental plane.
If you can find where a wizard previously moved their home to an elemental plane, you would be simply healing an anomaly. Much easier.
I was thinking like the train station in Harry Potter.
You walk toward the seam between the houses and it appears as a line that widens as you approach. The gates open as you approach. Why you need copies of the adjacent buildings is beyond me. Otherwise what Sandslice posted works fine.To actually insert space into an existing neighborhood, would create a mapmaker's anomaly. You would be walking about 10 more squares past the now 3 houses. You would have to insert it between 2 houses, not 4, give it an address of 9999.5 street name, and answer all questions with "because, magic". You are retooling and reversing the spell that inserts livable environment into an elemental plane.
If you can find where a wizard previously moved their home to an elemental plane, you would be simply healing an anomaly. Much easier.
What happens with 12 Grimmauld Place is a visual representation of a Fidelis Charm, a reverse subjective reality effect that causes everyone to disbelieve in something that is, save for the caster and those the caster has deliberately attuned.
In this house's case, Muggles not only can't conceive of there being a house between #11 and #13, they can't conceive of the possibility of a space where a house COULD be. It's literally the case that Muggles see no space whatsoever between those two houses, and in fact most wizards can't; but Dumbledore (as the caster) and those he's told it to, they literally see a mapmaker's anomaly - the entire universe being different to account for a house being there.
(As for the copies, it's simply for an optical illusion, to make it feel like you didn't just enter a demiplane but a weird spatial distortion. They aren't strictly necessary if you don't care about that (for instance, if your demiplane is a fancy version of Mordenkainen's Magnificent Mansion or somesuch.))