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The demiplane spell creates a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone.

Are these walls actually made from wood and stone? Can a character chip off a piece of stone? A sliver of wood? Would it be possible to hide in them using the meld into stone spell if they are of stone?

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  • \$\begingroup\$ Great questions, but I don’t think there are any answers. Even looking back to previous editions is no use, since demiplane is different from the methods of creating a demiplane in the past. \$\endgroup\$
    – KRyan
    Aug 1, 2022 at 17:48
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    \$\begingroup\$ I count five questions in this question, maybe some cleanup and focus is in order. \$\endgroup\$
    – Novak
    Aug 1, 2022 at 17:49
  • \$\begingroup\$ Hi @Novak, I’ll take off the Passwall, its less related to it being Stone. \$\endgroup\$ Aug 1, 2022 at 17:59
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    \$\begingroup\$ @Novak No, they're all aspects of one question, the one in the title: What's the nature of the wall? \$\endgroup\$ Aug 1, 2022 at 21:38

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Demiplane doesn't have walls in conventional sense. It just ends, looking like a wall to an observer (or like something else, according to the nature of specific demiplane).

According to Player's Handbook:

Demiplanes are small extradimensional spaces with their own unique rules.

A given demiplane can be entered through a single point where it touches another plane.

So, other than the door, it's not touching any other dimension. There is absolutely nothing through the "wall" of demiplane. No other plane, no space, no vacuum, nothing.

So the "material" of a demiplane, created specifically by Demiplane spell, is just an aspect of it, shaped by the spell (presumably for caster's convenience and sanity). It has no actual matter or thickness to it and doesn't separate demiplane from anything, since there is nothing on the other side. There is no other side altogether.

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    \$\begingroup\$ This answer could be improved by citing supporting material from the spell you reference. You're headed in the right direction, just needs a little bit of fine tuning! \$\endgroup\$
    – aaron9eee
    Aug 2, 2022 at 15:16
  • \$\begingroup\$ @aaron9eee D&D 5e seems to be rather slim on mechanics of demiplanes. :) I think the PHB quotes I provided are basis for the interpretation that there is nothing demiplane borders (and if so it has no wall to separate it from anything). \$\endgroup\$
    – Rarst
    Aug 2, 2022 at 16:23
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    \$\begingroup\$ I like this answer. Especially the highlight that the "wall" is part of the demiplane without thickness or matter. Yes, the books do not elaborate on it, but other options (like it being made of stone, or of magic) only lead to more problems or questions. \$\endgroup\$ Aug 2, 2022 at 17:07
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They are made of magic

As stated in the description:

When opened, the door leads to a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone.

The whole thing is a facade. It just looks like a room constructed of wood or stone. So you can't use any spells on/against the walls that require actual wood or actual stone.

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    \$\begingroup\$ If they are made of magic, what happens if you cast Antimagic Field in the Demiplane (say, after the spell duration expired and you are trapped there)? \$\endgroup\$ Aug 2, 2022 at 4:33
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    \$\begingroup\$ @GroodytheHobgoblin, that would make a good separate question. \$\endgroup\$
    – MivaScott
    Aug 2, 2022 at 4:54
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    \$\begingroup\$ Asked about that alongside the case of Dispel magic in this question. \$\endgroup\$
    – Matthieu
    Aug 2, 2022 at 9:56
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Probably not

The Demiplane spell’s description states:

(…)demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone.(…)

Appears to be meaning that it’s not really a room with wood or stone walls, it just looks like one. Since the spell only mentions appearance, I think it’s reasonable to assume that the walls only look like they’re made of stone, they don’t actually behave like stone walls (since you know, the spells-only-do-what-they-say-they-do thing). You probably then cannot either hide in them or chip anything off.

As to what exactly they’re made of and how they behave, I’m afraid there isn’t a lot of information. The walls are the boundaries of the demiplane that the spell creates but there’s not a whole lot of info on demiplanes in 5E, the only mention I found was in DMG, p.68 and all it says that might be relevant is that demiplanes are extradimensional spaces and can be as small as a single chamber. The whole demiplane is made of magic, so the boundaries probably are too but that’s as much as you can definitely state.

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