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When Forbiddance is used in a demiplane what effects should translate to the material plane where that demiplane occupies on the ethereal ?
Personally I think it should at least block ethereal travel and the damaging effects should only work on the demiplane itself but should it also block teleportation/plane shift/summoning spells as well ?
What should a Forbiddance spell look like on the ethereal ?
Would a Forbiddance spell already in effect on a demiplane count as overlapping if you were to cast one on the prime material ?
Forgive me if I'm misunderstanding the question, but I don't imagine Demiplanes actually occupying space on the ethereal plane (and thus not the material plane, either). They're extradimensional spaces. Thus, if a Demiplane has Forbiddance cast on it, that spell's effect occupies that demiplane alone, and not the material or ethereal.
Edit: To clarify, think of a Demiplane with a Gate as any other extradimensional space with a portal, such as the space within a bag of holding, or a mage's magnificent mansion spell. Now, eliminate that entrance. That's your demiplane by default- completely inaccessible except for whatever spell, Gate, or similar effect you use to force a new connection. Until then, nothing from either the material plane or the ethereal plane affects it at all, nor can it affect other planes.
Usually, when such a connection is made, the spell or effect that makes it describes what can and can't pass through. However, I'd still argue that there's no such thing as a bleed-out effect that creeps through a Gate from one plane of existence to the next, especially since a demiplane has no dimension within the ethereal at all.
You create a small, finite demiplane. You must be on the Astral or Ethereal Plane or on a plane that has access to one of those planes (such as the Material Plane) to cast this spell.
The demiplane is another plane of existence, and therefore is outside the range of any spell or ability that cannot affect or reach other planes. Creatures can only enter the plane by the use of planar travel magic such as astral projection, etherealness, or plane shift. You are considered "very familiar" with your entire demiplane.
Forbiddance seals an area against all planar travel into or within it. This includes all teleportation spells (such as dimension door and teleport), plane shifting, astral travel, ethereal travel, and all summoning spells. Such effects simply fail automatically.
1)The Forbiddance cast in the Demiplane only affects travel into or within the Demiplane. The Forbiddance must cover the whole Demiplane. At this point the only way into or out of the Demiplane would be with a permanent gate or the Gate spell.
The Ethereal Plane is a ghostly realm that exists as a buffer between the Material Plane and the Shadow Plane, overlapping each. A traveler in the Ethereal plane experiences the real world as if the world were an insubstantial ghost, and can move through solid objects without being seen in the real world.
A silvery void that connects the Material and Inner Planes to the Outer Planes, the astral plane is the medium through which the souls of the departed travel to the afterlife. A traveler in the Astral Plane sees the plane as a vast empty void periodically dotted with tiny motes of physical reality calved off of the countless planes it overlaps.
2) When an Ethereal traveler comes apon your Demiplane, they can see into it, just can't enter it. Forbiddance only blocks Travel. You could create your Demiplane with solid barriers around it to stop sight. Astral travelers would also see a tiny mote of your Demiplane, but there would be no details. As a side note, I think if someone dies in an area of a Forbiddance, there Soul could not travel to the afterlife (no Astral travel).
3) No, see answer 1.
Edit: To clarify, think of a Demiplane with a Gate as any other extradimensional space with a portal, such as the space within a bag of holding, or a mage's magnificent mansion spell.
A Bag of Holding is based off the Secret Chest spell, which moves the chest to the Ethereal Plane. If you place a Bag of Holding in a Portable Hole it forms a rift to the Astral Plane. Demiplanes and Extradimensional Spaces are not disconnected to the rest of the plains. The connections are just not explained well.
Hmm...
Well, I suppose the first thing we can agree upon is that the Forbiddance would not affect other planes of existence. Correct?
I suppose you're right about the Secret Chest thing. However, I'm not seeing at all where you derive your second response from.
The demiplane is extradimensional; It has no dimension- neither volume, nor place, nor the ability to 'see into it'- from another plane. It exists outside of that plane's dimensions, whatever those may be. Whatever dimensions you can assume a traveler to possess in that plane of existence, this demiplane does not possess, so there's no such thing as 'seeing into it' from the Ethreal. The only ways to get a defined opening into the demiplane is through spells like Gate.
I would make the same argument for a demiplane in the Astral, even though the astral is described as having 'motes' to other planes. Whatever you describe this mote to be, the demiplane's does not have any dimension and thus shouldn't be perceivable.
Extradimensional Spaces
A number of spells and magic items utilize extradimensional spaces, such as rope trick, bags of holding, handy haversacks, and portable holes. These spells and magic items create a tiny pocket space that does not exist in any dimension. Such items do not function, however, inside another extradimensional space. If placed inside such a space, they cease to function until removed from the extradimensional space. For example, if a bag of holding is brought into a rope trick, the contents of the bag of holding become inaccessible until the bag of holding is taken outside the rope trick. the only exception to this is when a bag of holding and a portable hole interact, forming a rift to the astral plane, as noted in their descriptions.
Emphasis mine.
Forbiddance cast on the prime material pla e would effect the corresponding ethereal and shadow plane that overlaps that section of the prime.
It's somewhat up to DM and players if creating a demiplane on the material plane that is housed in the ethereal plane would be to the overlapping section and not just out in the deep ethereal somewhere far away.
It shouldn't look like anything unless they have detect magic or arcane sight in which case they'll see the corresponding aura (nit withstanding their ability to look into or out of the ethereal plane, typically restricted to 60 feet and requiring see invisible true seeing.
Demiplanes themselves are little bubbles of demiplane reality floating through the astral or ethereal and shouldn't really be happened upon randomly given the vast spaces they are contained within. It isn't really specified what they look like from outside and whether an astral traveler could just walk on in into one, it's really the purview of the DM, a simple suggestion would be to assume it contained within a wall of force but there's such RAW.
It isn't really specified what they look like from outside and whether an astral traveler could just walk on in into one, it's really the purview of the DM,
..."Extradimensional" or "Nondimensional" should cover that, I would think. Likewise, there would be no overlap, as the demiplane's space is not part of, overlapping, or shared with the plane it's housed in. It has no space within that plane of existence.
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Unfortunately being extra dimensional doesn't jive with the spell description.
The demiplane is another plane of existence, and therefore is outside the range of any spell or ability that cannot affect or reach other planes. Creatures can only enter the plane by the use of planar travel magic such as astral projection, etherealness, or plane shift. You are considered “very familiar” with your entire demiplane
This implies someone could travel through the astral plane to a demiplane, which makes some sense as that's how planar travel occurred traditionally.
From the spell:
Effect extradimensional demiplane, up to three 10-ft. cubes/level (S)
'Extradimensional demiplane' isn't really a defined term and may be somewhat contradictory, demiplanes are just catch-all category of their own:
Demiplanes
This catchall category covers all extradimensional 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. There are countless demiplanes adrift in reality, and while most are connected to the Astral Plane and Ethereal Plane, some are cut off entirely from the transitive planes and can only be accessed by well-hidden portals or obscure magic spells.
Extradimensional Spaces
A number of spells and magic items utilize extradimensional spaces, such as rope trick, a bag of holding, a handy haversack, and a portable hole. These spells and magic items create a tiny pocket space that does not exist in any dimension. Such items do not function, however, inside another extradimensional space. If placed inside such a space, they cease to function until removed from the extradimensional space. For example, if a bag of holding is brought into a rope trick, the contents of the bag of holding become inaccessible until the bag of holding is taken outside the rope trick. The only exception to this is when a bag of holding and a portable hole interact, forming a rift to the Astral Plane, as noted in their descriptions.
Taken together would mean bags of holding are inert on demiplanes.
Planes overlap each other all the time, so it could or couldn't depending on the table.
The only ways to get a defined opening into the demiplane is through spells like Gate.
The above is true,Greater Demiplane has a permanent one.
Portal: Your demiplane gains a permanent gate to one location on another plane, which can only be used for planar travel.
So if its not a Greater Demiplane, how do you get there...
Creatures can only enter the plane by the use of planar travel magic such as astral projection, etherealness, or plane shift.
A Demiplane is connected to the Transitive Planes, or else you could not use them to enter the Demiplane. If you can't see the Demiplane how do you get there. Forbiddance stops the ability to use the Transitive Planes to travel in its area of effect.