I've been looking into various spells and found myself in a dilemma;

"Planar travel is blocked within the warded area"

Can this effect, if chosen, be selective?

I ask this because i've been going through HalfOrcHeavyMetals' idea;
create a demiplane, fill it with stuff that make it habitable, block any access.
" slap Mordenakien's Private Sanctum for a year in that bad-boy and you've basically got an impregnable fortress to anything that isn't a Demon Lord-tier threat"

I love the idea, but am worried about the Sanctums' effect.

If you put in a block for extraplanar travel then all such travel is blocked. You don't get to pick and choose.

You can, however, be very specific of how much area the sanctum wards. Spells like Demiplace and Gate create a portal (in the case of Demiplane it's a shadowy door), so you could ward up to 29 ft, and leave that remaining 1 ft available for Demiplane or Gate. However, Plane Shift would be blocked. Any warding you place will ward against you too.

You'll need to work with the DM to decide if the Demiplane has its own air supply. If not, then, that could be a problem.

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Demiplane is not very good as a "safe home". If you're in it when the door closes you're stuck until you cast other spells: Plane Shift or Gate (you could also use Astral Projection). You cannot use the spell Demiplane to get back to the Material plane. It's not very secure when casting Demiplane either: the doorway remains open for the 1 hour - you cannot dismiss it early, so if you need to close it off earlier you need to Dispel it - and unless you use your 9th level (since you've used your 8th) slot, it's possible to waste multiple spell slots since its a DC 18 check.

Demiplane is designed for storage, not living in.

You're better off using Mordenkainen's Magnificent Mansion. It's portable, the door when closed is invisable and nobody but you can open or close it and only you and those you specify can enter, even if the door was open. The food and drink and everything refreshes every time you cast it, and you can easily secure the doorway and the area around it. You could even cast the mansion while inside a demiplane. The demiplane can be filled with traps (Glyph of Warding, Symbol) for trespassers and even if they survive those - the door's invisible, indestructible and they can't pass through. The only way to get to somebody inside the mansion is to dispel that doorway which is a DC 17 check or requires 7th level cast -- you could even cast the mansion at 9th level, so it would be DC 19 / 9th level Dispel to get rid of it.

Probably the closest you can get.

I have no idea what you're on about.

I don't know why you're mentioning things like bags of holding.

And the Demiplanes you create with Demiplane are permanent.

My response was based on using the spells and rules as they are in game. The "talk to DM" is always an option, since they could just give you literally anything. For a thread asking about the limitations of Private Sanctum spell in making a safe home.

If we're going into magic items, the OP can just get a Rod of Security. I don't think that's what they want though.

Quote from Kotath >>

Quote from Cyb3rM1nd >>

I have no idea what you're on about.

I don't know why you're mentioning things like bags of holding.

And the Demiplanes you create with Demiplane are permanent.

My response was based on using the spells and rules as they are in game. The "talk to DM" is always an option, since they could just give you literally anything. For a thread asking about the limitations of Private Sanctum spell in making a safe home.

If we're going into magic items, the OP can just get a Rod of Security. I don't think that's what they want though.

 

The demiplanes created are permanent but the doors are not. "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."

I was mentioning things like bags of holding because normally if you bring one into another extra dimensional space, it explodes ripping a tear into the astral plane. That is a pretty well known rule.

 
Yeah, I mentioned the door.

And I know that rule (bags/hole/haversack/etc). I still don't know what relevance it has to this conversation.

Quote from Lyxen >>

Quote from Cyb3rM1nd >>

And the Demiplanes you create with Demiplane are permanent.

 

Just note that there is no mention that you are actually creating something with Demiplane, even with the first casting: "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."

It might have pre-existed, you might just be renting it from some cosmic entity. :)

And then you can imagine tons of storylines just like the one I evoked in another thread about Bag of Holdings all connecting to a Gringott's like interdimensional vault with its own guardians, etc.

Just want to point out the second paragraph;
"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"

so you have the choice to create a demiplane and then re-open it whenever.
i think, might be wrong.

I like the idea as well. Maybe add some character to a Warlocks' patron.
Rent some space or a hide-away in exchange for some favours/souls/money/romance advice.

Quote from Kotath >>

The mansion normally is considered to count as such a space, thus having that vulnerability, using the specific term 'extradimensional space.' Demiplane does not seem to, referring to the effect as creating a 'Demiplane' without using the term 'extradimensional.'

The mansion is a spell, not an item, the bag/haversack/etc restriction doesn't apply. It only applies to items that contain within them a permanent extradimensional space.

Even missing that, there's a basic level of common sense that the intention is to stop people creating infinite storage with an uncommon item (that is relatively easy to get/make hence being "uncommon"). It should also be obvious that a party is very likely to have one of these items, by the time 7th level spells come around shouldn't have to worry about casting a spell deliberately designed to keep them safe for a night.

I hope I never get you as a DM, you'd be exhausting.

Quote from Lyxen >>

Quote from Cyb3rM1nd >>

And the Demiplanes you create with Demiplane are permanent.

 

Just note that there is no mention that you are actually creating something with Demiplane, even with the first casting: "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."

It might have pre-existed, you might just be renting it from some cosmic entity. :)

And then you can imagine tons of storylines just like the one I evoked in another thread about Bag of Holdings all connecting to a Gringott's like interdimensional vault with its own guardians, etc.

 
Nah they're created as kootranova1 points out. But that would be interesting. Especially in Eberron, House Kundarak could probably create keys so clients can cast the spell for a specific demiplane only... >.>

Quote from Lyxen >>

Just what I needed to repeat an old story of mine in which we clearly went overboard (but this was AD&D, so... :) ):

That being said, my oldest AD&D character was a wizardess and had both a portable hole and a mirror or mental prowess. So, the trick was to open the hole, get down into it, You then cast rope trick from within the hole, making sure that the opening is inside the hole. You climb in the rope trick and you open the mirror of mental prowess to scry the area where you left the hole. You step out, fold the hole from outside, put in in your pocket, and get back in the rope trick via the mirror. You are now in your own pocket, and can navigate the dungeon by scrying areas through the mirror. You can position the opening behind guards and have the thief get out of it and backstab all the guards. Lots of fun... :D

 
That sounds ******* amazeballs. That must have been incredible fun. Hmm.. Maybe can homebrew something... >.>

Quote from Kotath >>

Quote from Cyb3rM1nd >>

Quote from Kotath >>

The mansion normally is considered to count as such a space, thus having that vulnerability, using the specific term 'extradimensional space.' Demiplane does not seem to, referring to the effect as creating a 'Demiplane' without using the term 'extradimensional.'

 

The mansion is a spell, not an item, the bag/haversack/etc restriction doesn't apply. It only applies to items that contain within them a permanent extradimensional space.

Even missing that, there's a basic level of common sense that the intention is to stop people creating infinite storage with an uncommon item (that is relatively easy to get/make hence being "uncommon"). It should also be obvious that a party is very likely to have one of these items, by the time 7th level spells come around shouldn't have to worry about casting a spell deliberately designed to keep them safe for a night.

I hope I never get you as a DM, you'd be exhausting.

 

Quote from Lyxen >>

Quote from Cyb3rM1nd >>

And the Demiplanes you create with Demiplane are permanent.

 

Just note that there is no mention that you are actually creating something with Demiplane, even with the first casting: "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."

It might have pre-existed, you might just be renting it from some cosmic entity. :)

And then you can imagine tons of storylines just like the one I evoked in another thread about Bag of Holdings all connecting to a Gringott's like interdimensional vault with its own guardians, etc.

 
Nah they're created as kootranova1 points out. But that would be interesting. Especially in Eberron, House Kundarak could probably create keys so clients can cast the spell for a specific demiplane only... >.>

 

Quote from Lyxen >>

Just what I needed to repeat an old story of mine in which we clearly went overboard (but this was AD&D, so... :) ):

That being said, my oldest AD&D character was a wizardess and had both a portable hole and a mirror or mental prowess. So, the trick was to open the hole, get down into it, You then cast rope trick from within the hole, making sure that the opening is inside the hole. You climb in the rope trick and you open the mirror of mental prowess to scry the area where you left the hole. You step out, fold the hole from outside, put in in your pocket, and get back in the rope trick via the mirror. You are now in your own pocket, and can navigate the dungeon by scrying areas through the mirror. You can position the opening behind guards and have the thief get out of it and backstab all the guards. Lots of fun... :D

 
That sounds ****ing amazeballs. That must have been incredible fun. Hmm.. Maybe can homebrew something... >.>

 

 

And the OP is talking about making a permanent arrangement. Since 'mansion' does not create anything permanent, that would mean enchanting an item to create a permanent mansion / mansion equivalent. Now you have an item based 'extradimensional space.' Same issue with Rope Trick or any similar spell. 

 kay, except you didn't even mention this as probable context, hence why he was so in opposition to your comment... because you were working under a different assumption that nobody else knew because you never said anything about it.

Just to clarify I'm well aware that the mansion is temporary but it seemed the OP was more into having a home that was safe and could not be trespassed - portability was a factor but didn't really seem to be "the point" (an impenetrable home). While Magnificent Mansion is temporary, it is usable as a home and there are ways to secure the door to it, making it a potentially better option than using Demiplane with Private Sanctum.