Create Demiplane, Greater Question

[Muckles]

When casting this spell for the first time do you get to add all the options available to the plane that you so desire, and can cast it again to change those features, or do you need to make the plane, then cast it again for each additional aspect of the plane that you want to put into it? If so that is going to get real expensive really fast :(

Is additional casting in your plane specifically supposed to be more for making it bigger or lasting longer?

Thanks for everyone's help in advance!

[Bob Bob Bob]

Lesser Create Demiplane wrote:

When you cast the spell, you decide whether the demiplane is within the Astral or the Ethereal Plane. It is filled with air or water (decided by you). The plane is generally flat and featureless, such as an earth, stone, water, or wood floor. The “walls” and “ceiling” of the plane may appear like solid earth, stone, wood, or water, or they may end in mist, a featureless void, or a similar unreal-looking border. The plane’s environmental conditions are those of a temperate spring day on the Material Plane. You determine the plane’s light level (bright, normal, dim, or darkness), which affects the entire plane.

Create Demiplane wrote:

This spell functions as create lesser demiplane, except the area is larger and you can add more features to the plane. You can use this spell to expand a demiplane you created with create lesser demiplane (you do not need to create an entirely new plane using this spell), in which case it has a duration of 1 day/level. Alternatively, when cast within your demiplane, you may add (or remove) one of the following features to your demiplane with each casting of the spell, in which case it has an instantaneous duration.

Greater Create Demiplane wrote:

This spell functions as create demiplane, except the area is larger and you can add more features to the plane. You can use this spell to expand a demiplane you created with lesser create demiplane or create demiplane (you do not need to create an entirely new plane using this spell), in which case it has a duration of 1 day/level. Alternatively, when cast within your demiplane, you may add to your demiplane (or remove from it) one of the following features (or any of the features described in create demiplane) with each casting of the spell, in which case it has an instantaneous duration.

It looks like you get to choose Material or Ethereal, water or air, light level, and a general theme (walls and ceiling). That's apparently all you get for free. It also specifies that you can only add one feature at a time with each new casting.

Why do you think it's expensive though? It uses a focus, not a material component. You just need it once. And adding features is instantaneous, i.e. permanent and undispellable.

[Muckles]

I thought that with each casting that you wanted to be permanent you had to make pay the 22,500 gp cost that it mentions in the bottom?

"You can make this spell permanent with the permanency spell, at a cost of 22,500 gp. If you have cast create greater demiplane multiple times to enlarge the demiplane, each casting’s area requires its own permanency spell."

do you only pay that cost when enlarging it or when you add features?

Also to cast it is - Casting Time 6 hours
Components V, S, F (a forked metal rod worth at least 500 gp) which I guess in the long run past level 10 isn't a big deal

[Bob Bob Bob]

Create Demiplane wrote:

Alternatively, when cast within your demiplane, you may add (or remove) one of the following features to your demiplane with each casting of the spell, in which case it has an instantaneous duration.

Creation Subschool wrote:

Creation: a creation spell manipulates matter to create an object or creature in the place the spellcaster designates. If the spell has a duration other than instantaneous, magic holds the creation together, and when the spell ends, the conjured creature or object vanishes without a trace. If the spell has an instantaneous duration, the created object or creature is merely assembled through magic. It lasts indefinitely and does not depend on magic for its existence.

Bolding mine. Adding or removing features changes the duration to instantaneous. Instantaneous duration on a Conjuration (creation) spell means that the spell makes something which then sticks around forever. The something in this case is the changes to the demiplane. The only thing you need to use permanency on is creating or expanding it.

Alternatively, you can just cast it again to renew the duration. It's days/level, you don't have to check in more than once a week.

Again, "F (a forked metal rod worth at least 500 gp)" is a one time cost. It's a focus, not a material component. You buy it once and you can use it again and again. By the time you're throwing around 7th level spells a single 500 gp purchase should be peanuts.

[zza ni]

well the add on is instantaneous so it has no duration of it's own. but it is added to the plane which has.
if you made the original plane and used permanency then any add on would stay for ever. but if not, they go out once the plane does. (they add stuff to the original plane thus use it's duration ,the extra casting has no duration to count off. but the main plane does)