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I've been tossing around ideas for housing for a high level mage (theoretical at this stage) and the main problem I've been having is size vs comfort/convenience. I wanted a reasonably sized tower on the material plane I could use but still have a fair degree of comfort on the material plane then this idea popped into my head.
Instant Fortress + create demi plane greater made permanent.
I would actually prefer mages magnificent mansion with its entrance in the tower but weirdly you can't make that one permanent without GM ruling whereas the Demi-Plane you can even if it expensive.
This way you'd have the portable tower with (using the old DND stronghold builders guide) a basement (10 feet below ground luxury storage), stables (10 feet ground floor luxury stbales), rooms for dealing with guests (10 feet above ground tossing up between fancy common area, luxury shop or fancy throne room) and an office and the permanent entrance to the demi plane (final 10 feet above ground fancy study/office). Then in the demi plane itself you can have the mages private rooms e.g. library, bath, laboratory, living quarters, treasury, conservatory, etc all without worrying about needing 20 floors of tower to fit it all in.
This way when the mage needs to deal with the material plane they have a portable base with all the comforts/requirements they need and if the want to move they just minimizes the tower while people can stay in the pocket plane.
Like I said magnificent mansion would be better if you could make it permanent so you can leave things in there but I think this would work.
As a GM, I would have no problem with it. However, since you're basically dealing with a magic item that stores it's insides in another dimension... and you're sticking the entrance to a demiplane in there, I would rule that you must have the proper item creation feat and spell to perform the ritual needed to modify the magic item otherwise, the demiplane entrance would either disappear (spell negated) when the tower is "minimized" or the the tower would disappear with a "pop". It's a good idea, though.
Pretty sure the portal wouldn't move with the Instant Fortress.
There's nothing indicating that ANYTHING in the fortress stays with it, actually. It even says "It cannot be deactivated unless it is empty." Nothing indicates it's an extradimensional space, either. It's mostly just an object that changes size.
The portal is also anchored to the plane and not whatever object it interacts with; it's basically just a tear in reality.
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But you anchor said tear to the part of reality which is the room on the 3rd floor of the fortress. Just like you can put a door in a wall, move the wall and the door goes with it.
Said fortress being empty is one of those debate issues I think as needing to take out every single piece of dust to minimise it is ridiculous but technically a piece of lint in the basement would mean it wasn't empty and thus you can't turn it into a cube. I've always read that restriction as you can't have something part of the fortresses constitution e.g. treasure, people, food all the tables, chairs, beds, barrels and if it's part of the original design as chuck would require this portal. I was referring to the Demi-Plane/mansion as an extradimensional space just wasn't sure what the tower actually counts as since it changes size/shape.
There's actually no real portal to the demiplane. You just will yourself there. The tower would need to be modified to have a permanent portal to the demiplane. So, again as a GM... My ruling only... I would allow it with the item creation feat to perform the ceremony.
The Portal feature of Greater Create Demiplane is the portal being referred to.
I agree with Chuck. The debate is what is meant by a portal in the Create Greater Demiplane spell, which says:
Portal: Your demiplane gains a permanent gate to one location on another plane, which can only be used for planar travel. This location must be very familiar to you. This gate is always open and usable from both sides, but you can secure it using normal means (such as by building a door around it).
So can I do the lion, witch and wardrobe thing and place the portal in a wardrobe and move it around as I wish? Can I have the portal be on s ship? Or is the portal a fixed place (lets not get into planetary rotation, orbits and galaxy movement)that cannot be moved?
I would side with the idea the portal can be affixed to a structure, and the structure can be moved, but at the same time would not argue the call that if the portal is on the fourth floor of you mansion and your mansion is destroyed, the portal remain open to both side, hanging up there in a fixed place above the ruins!
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In this case the portal would lead to a wall on the 2nd floor of the instant fortress and be secured with a door. My reading of the portal feature is it leads to a familiar location whether that's mid-air in a forest glade, on board a ship or in a mages tower it's then linked to that spot so if the spot moves it moves with it. Of course you need to move the whole thing it's linked to.
In this case the portal would lead to the 2nd floor of the instant fortress and be secured with a door.
That's what I would allow, but another GM could fairly state once you move the fortress, the portal stays where you first created it -not moving with the fortress.
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Which would be a gm issue and honestly I'd be asking if I could permanent a magnificent mansion as it offers some advantages over a Demi-Plane such as the servants. What I was looking for here was whether there'd be a rules issue on the linking itself rather than the moving I.e. Minimising the tower would make the plane collapse or explode.
Sorry. That was the Greater version of the spell, which I never read until now. :)
"One location on another plane" may be intentionally vague. I think it allows it to be a permanent location in a peaceful glade or a mountain top or, as the spell says, "you can secure it using normal means (such as by building a door around it)", put it in a doorway. Magic is fluid and open to interpretation. At least, that's how I GM it. I would allow it put in a doorway and, if the doorway is destroyed, so is the gate. Fortunately, the doorway can;t be destroyed without dispelling the gate or doing something spectacular to it... like dropping a mountain on it. Or the Tarrasque eats it. But, since you want it in a magic item that transforms into a small cube, I would rule that the item has to be modified since, when you dismiss the fortress, the doorway disappears. No doorway for the portal to be attached to.
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Shame I can't do whatever I want or I'd use the stronghold builder guide from 3rd Ed with a mythic mage. The tower doesn't need to fold up as it can fly, burrow, swim?, teleport (twice per day), planeshift (twice per day) and thus wouldn't need to be made smaller for portability (throw in some other benefits like a table of feasting or make it out of this mysterious Obdurium). Then just put the mythic sanctum door in my study and I'm good to go. Of course technically I don't need a mythic sanctum as a modified flying tower gives you plenty of rooms although I personally consider it more a flying keep than a flying tower. It has to be 40!feet across.
Oh well seems I'll have to settle for a more immoveable tower with the gate linked to it and rely on spells like magnificent mansion when travelling if I'm reading the tone of responses correctly. It can be done but when you move the tower it doesn't go with it. Not sure I agree with it since I'd consider a room a location but such is life.