You create a shadowy door on a flat solid surface that you can see within range. The door is large enough to allow Medium creatures to pass through unhindered. 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. When the spell ends, the door disappears, and any creatures or objects inside the demiplane remain trapped there, as the door also disappears from the other side.
Each time you cast this spell, you can create a new demiplane, or have the shadowy door connect to a demiplane you created with a previous casting of this spell. Additionally, if you know the nature and contents of a demiplane created by a casting of this spell by another creature, you can have the shadowy door connect to its demiplane instead.
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Posted Feb 10, 2025Regarding some of the comments, spells do only what they say they do.
As noted previously, a teleportation circle or any other teleportation spell cannot take you anywhere that is not the same plane.
The spell description describes the appearance and shape of the plane, and does not describe any special planar effects such as different time flow; therefore, these effects are not included in the spell.
The spell mentions that Medium creatures can pass through, and "large enough" lets us surmise that smaller creatures can pass through: it does not say anything at all about anything else passing through except implicitly as carried by a creature, so any suppositions about filling it with or emptying it of water or other substances under the influence of gravity are not supported by the text of the spell.
That said, I would possibly allow such a use: with spells like Sunburst and Incendiary Cloud at the same level that are more destructive and tend to have some advantages, such as hurting flying creatures, being instantaneous, letting someone dump some water or acid in their enemies hardly seems game-breaking (they'll still get a Dexterity save, obviously; it's likely to only affect a small area before the combat is over; it won't do much damage; and substances might undergo unwanted transformations (e.g. evaporation or solidification) if the demiplane is not used quickly.
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Posted Feb 18, 2025It isn't rules as written, but I would rule that if you cast his spell from inside a demiplane that you created, you can use it to return to your last position on the prime material plane.
It does add a level of versatility to the spell, but it is 8th level, and I don't think being able to travel to the prime material by casting an 8th level spell TWICE is game-breaking.
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Posted Feb 25, 2025Only to get to another Demiplane created with the spell. You can’t use Demiplane to get to a normal plane.
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Posted Feb 25, 2025I’d like to know this as well. Same question for Rope Trick. Is it a blank impenetrable wall? Empty space to the edge of infinity?
the v3.5 DMG p.147 says:
Demiplanes: This catch-all category covers all extradimen-sional spaces that function like planes but have measurable size and limited access. Other kinds of planes are theoretically infinite in size, but a demiplane might be only a few hundred feet across.
different edition, but anyway, measurable size implies a boundary that’s infinitely thick and impenetrable to everything.