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How do effects that prevent planar travel interact with Mindscapes?
Mindscapes are temporary constructs of the mind that come into being on the Astral Plane and fade away again, in much the same way a sleeping person's imagined landscape forms and dissolves while he is dreaming. The primary difference between a mindscape and a dream is one of intent; a creature often deliberately and precisely constructs a mindscape, while a dreamer typically does not. A mindscape can come into existence as a result of creatures engaging in a psychic duel, as well as through certain spells, magic items, rituals, and other occult phenomena.
The create mindscape spell is an illusion (phantasm) spell.
Phantasms are "totally in the minds of the subjects"
Phantasm: A phantasm spell creates a mental image that usually only the caster and the subject (or subjects) of the spell can perceive. This impression is totally in the minds of the subjects. It is a personalized mental impression, all in their heads and not a fake picture or something that they actually see. Third parties viewing or studying the scene don't notice the phantasm. All phantasms are mind-affecting spells.
If for example a mindscape spell targets someone within a Forbiddance spell (Forbiddance seals an area against all planar travel into or within it) what would the effect be?
Do minds need to be able to travel to the astral plane to be in a mindscape or merely perceive it?
What happens if a mindscape spell ends within an area that prohibits planar travel? Does the mind get stranded on the Astral plane, unable to return to the body?
My impression is that these things work like dreams. Your physical body doesn't travel to the dimension of dreams when you dream, and thus forbiddance wouldn't prevent one from dreaming.
forbiddance blocks it.
From forbiddance
Forbiddance seals an area against all planartravel 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.
Key is this line : come into being on the Astral Plane.
As the spell is a form of astral travel the spell automatically fails, its a flavorful, fun, low level version of astral projection that instead of taking you to a plane takes you to a temporary demiplane.
The illusion is the ground and the like. You can create illusory creatures within the mindscape, but you're able to direct or concentrate on only one at a time. A mind scape is pretty much like the matrix. Just magic based, not technology based. So planar block effects equal autofail.
I agree more with Oliver but it is not very clear. I view the mindscape spells as similar to astral projection (consciousness leaves, body remains). Astral projection would certainly be blocked by Forbiddance.
This still leaves unanswered what happens to someone in a mindscape if they are prevented from returning their conscious mind to their body. I don't think their body would immediately die as their unconscious remains.
While a creature's consciousness is within a mindscape, that creature's body in the real world can take no actions and loses its Dexterity bonus to AC, but it isn't considered helpless, as the unconscious parts of the creature's mind still provide resistance to the creature's destruction.
What method would exist to reunite the two or would the mind simply reassert itself eventually as if waking up from sleep?
so does forbiddance block dreaming then?
TIL forbiddance blocks planar stuff + dream message, kinda cool