
PayneMykonos |

Enlarge would increase their range, so you could cast them further away, Widen has no affect, since they have no area of affect.
Okay, but what would increase their 'area'?
(Maybe 'size' is a better term?)They do have either a cubic area or size that is either set or affected by level.
How are those area defined if not duration/ area of effect/ range?
There's a lot of Feats that modify properties but I don't want to twist the wordings.
Echoing Spell Metamagic +3 — Cast a spell a second time.
Empower Spell Metamagic +2 — Increase spell variables by 50%
Enlarge Spell Metamagic +1 — Double spell range
Extend Spell Metamagic +1 — Double spell duration
Heighten Spell Metamagic Special Treat spell as a higher level
Intensified Spell Metamagic +1 — Increase maximum damage dice by 5 levels
Maximize Spell Metamagic +3 — Maximize spell variables
Quicken Spell Metamagic +4 — Cast spell as a swift action
Reach Spell Metamagic Special — Increase spell range to higher range category
So many variables & qualities can be modified: how are these areas defined?
Is there no feat that modifies it?

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So many variables & qualities can be modified: how are these areas defined?
Is there no feat that modifies it?
Echoing merely allows you to cast the spell once without spending the spell slot. Not the same as casting it twice.
Empower, none of those spells have variables. Variable requires a dice roll.Enlarge, only affects Mage's Magnificent Mansion because it is the only spell you listed that has a range of Close, Medium or Long. This only affects where the entrance is placed.
Extend, affects them all since they have a duration.
Heightened, yes affects all 3, but effectively does nothing unless you are trying to rope trick inside of a globe of invulnerability.
Intensified, no damage dice, and no variables,
Maximize, same as Empower, no variables.
Quicken, yes but not Create Demiplane since the cast time is longer than 1 round action.
Reach, yes but not Create Demiplane since the range is 0, not touch/close/medium. Only affects where the entrance is located for Mansion, and how far away the rope can be for Rope Trick.
Widen, "You can alter a burst, emanation, or spread-shaped spell to increase its area." None of these spells have a burst, emanation or spread so widen does nothing.
Reread up on the Aiming a spell section of the rules for burst/emanation/spread/cone/sphere/line/cylinder/shapeable/etc. Basically, only Demiplane and Mansion have areas at all, and they are specifically 'shapeable' (because they have the S in their description), and Widen is only for other types of shapes, not shapeable.

PayneMykonos |

I've noticed that those spells generally have space for a typical adventuring party, what exactly are you needing the extra space for?
I wanted a way for my wizard to become really epic. His own huge demiplane with enough space for an ecosystem and realm (castle, peasants, small army).
He also would specialize in conjuring mazes, haunted cabins in the wood, sentient houses, moving keeps and secret places all over the planes.I need those to be big enough for adventurers to get trapped in, legends to be said about them and being able to have portable holes with undead armies in it (no need to breathe).
I have made an arcane version of 'Animate objects'. A necromantic spell that adds the Haunted template to objects.
Makes a great haunted house.
But my ultimate plan is to recreate a small demiplane for me to rule. (I want to recreate the plane of eternal Fall in 'Castle Greyhawk'.)
With 600,000 GP in my budget it would be big but I am unable to understand why this particular area spec does not have its own Feat modifier.
All others have one. :(

Archaeik |
Spell Perfection would allow you to double the caster level bonus from Spell Specialization, that's about it.
There's that ioun stone with +1 caster level, I'm sure there's a few more tricks.
Ask you GM what kind of caster level boost you can get from burning a Wish. (probably will not be cost effective)

TxSam88 |

TxSam88 wrote:I've noticed that those spells generally have space for a typical adventuring party, what exactly are you needing the extra space for?
I wanted a way for my wizard to become really epic. His own huge demiplane with enough space for an ecosystem and realm (castle, peasants, small army).
He also would specialize in conjuring mazes, haunted cabins in the wood, sentient houses, moving keeps and secret places all over the planes.
I need those to be big enough for adventurers to get trapped in, legends to be said about them and being able to have portable holes with undead armies in it (no need to breathe).I have made an arcane version of 'Animate objects'. A necromantic spell that adds the Haunted template to objects.
Makes a great haunted house.But my ultimate plan is to recreate a small demiplane for me to rule. (I want to recreate the plane of eternal Fall in 'Castle Greyhawk'.)
With 600,000 GP in my budget it would be big but I am unable to understand why this particular area spec does not have its own Feat modifier.
All others have one. :(
This is kinda funny, I basically did this is a previous campaign. Back in D&D 1.0 we played what would be a Mythic campaign by today's standards. Among other incredible artifacts, my character wound up with "Hermes Infinite Bag", a typical bag of holding with an infinite sized space inside. I did exactly as you suggest, created land and weather, light and dark, populated it with my own portable kingdom with it's own dragon riding army.
What you are wanting is artifact level items, and beyond the scope of typical pathfinder rules. You will need to work with your GM to determine some sort of "extra" campaigning and research, etc that you will need to do to do all of this. Also, 600K probably won't cut it.

PayneMykonos |

We have started having mythic levels in the campaign. But beyond the final goal (that may be only unattainable in-game), I fell there should be such a Feat.
All spell variables can be changed except this are/not-an-area for some reason?
Sure it would be powerful, but no more than, say "Widen spell".
And I would assume a +1 to +3 spell casting level.
Furthermore very few spells would be affected.
I guess I might have to ask for GM approval.

PayneMykonos |

Creating a new Metamagic Feat is not hard, but unlike spells it's difficult to assign a cost/time /prerequisite.
"Inflate Spell, Metamagic, Level Increase +2, Double a spell's shapeable (s) area or extra dimensional space's holding capacity. (Such as Rope Trick.)"
Widened spells increase damage on an area for a +3 Level and Extend may cause damage twice as long (say Summon spells or cloud spells) for +1.
Since these type of spells usually do no damage and are rarer I would argue for this +2 or even only +1 level increase.
Thoughts?
Maybe prerequisite; any one other Feat that changes a spell's specs.