What is the quickest way to build thick walls?

[Quintain]

I'm looking for a way to create stone walls quickly -- having a very short timeframe in which to complete the work -- Walls on the order of
90' long, 30' high, 20' thick.

Does anyone have any sort of combination of spells/effects/abilities etc to do this. I need 4 of the walls of the dimensions described above.

The environment is an underground room shaped like a cross (for those who know, the Lower Temple of Orcus in Rappan Athuk).

Cost really isn't a consideration.

Having just had a inspiration, would a mold of walls of stone spells strategically placed, and then using rock to mud and mud to rock spells to fill the molds and solidify the product in layers.

Does anyone see any issue with that idea?

[PossibleCabbage]

10th level geokineticist with shift earth and stone sculptor? That character can pile rocks (well, 5' cubes) on top of each other all day.

Does this need to be "a matter of hours" or "a matter of rounds"? Since that character can throw up a 90'x30'x20' wall in a little under an hour with no expenditure of resources beyond time.

[Quintain]

The best would be "a matter of rounds", given that post initial slaughter of the temple occupants, we expect to get hit by reinforcements fairly rapidly.

I've worked up my method and given free time to work, this can be done with 6 scrolls of Wall of Stone (@ 20th level), and 4 scrolls of transmute rock to mud and 4 scrolls of transmute mud to rock.

So we are looking at ~20 rounds give or take (including movement) given uninterrupted actions.

[Firebug]

Wall of stone: 6 scrolls 5*20*25 = 15,000 gp
Transmute Rock->Mud: 4 scrolls 5*9*25 = 4,500 gp
Transmute Mud->Rock: 4 scrolls 5*9*25 = 4,500 gp
Total: 24,000 gp.

Wish: 1 scroll 9*17*25 + 25,000 = 28,825 gp.

[Quintain]

Firebug wrote:

Wall of stone: 6 scrolls 5*20*25 = 15,000 gp

Transmute Rock->Mud: 4 scrolls 5*9*25 = 4,500 gp
Transmute Mud->Rock: 4 scrolls 5*9*25 = 4,500 gp
Total: 24,000 gp.

Wish: 1 scroll 9*17*25 + 25,000 = 28,825 gp.

Unfortunately, the scrolls cast at level 9 won't fill the volume of the areas that I'm creating. It will need to be cast @ 20th to get that volume of mud.

I'm looking to fill a grand total of 126,000 cubic feet of open space with mud. (two 36,000 volumes and one 54,000 volume)

A 9th level caster can fill 18,000 per casting.

[Firebug]

In that case you end up with:
Wall of stone: 6 scrolls 5*20*25 = 15,000 gp
Transmute Rock->Mud: 4 scrolls 5*20*25 = 10,000 gp
Transmute Mud->Rock: 4 scrolls 5*20*25 = 10,000 gp
Total: 35,000 gp.

Wish is cheaper.

[Quintain]

Firebug wrote:

In that case you end up with:

Wall of stone: 6 scrolls 5*20*25 = 15,000 gp
Transmute Rock->Mud: 4 scrolls 5*20*25 = 10,000 gp
Transmute Mud->Rock: 4 scrolls 5*20*25 = 10,000 gp
Total: 35,000 gp.

Wish is cheaper.

I'm not positive that the GM will say that a Wish used to duplicate a spell will cover multiple castings.

[Create Mr. Pitt]

Summon Trump

[Firebug]

Quintain wrote:

Firebug wrote:

In that case you end up with:

Wall of stone: 6 scrolls 5*20*25 = 15,000 gp
Transmute Rock->Mud: 4 scrolls 5*20*25 = 10,000 gp
Transmute Mud->Rock: 4 scrolls 5*20*25 = 10,000 gp
Total: 35,000 gp.

Wish is cheaper.

I'm not positive that the GM will say that a Wish used to duplicate a spell will cover multiple castings.

Why not? Protection from Alignment -> Communal = 1 level increase, Circle = 2 increase

Fly, Cure Light, Suffocation, Bull's Strength, etc -> Mass 4 level increase

Transmutes and Wall of Stone are all 5th level spells, so I'd say that the effect you are going for is right around the power level of a single casting of a 9th level spell.