
Haldelar Baxter |

What spells are best for repairing and upgrading large fortifications? There's some obvious ones like Wall of Stone,
Looking for;
any repair spells like Make Whole but not restricted by weight or size.
any spells for moving large buildings long distance.
Long term heating in cold climate, current ideas are multiple Campfire Beads, or a Mallet of Building and just creating the fence posts in a modified hearth

avr |

Teleportation Circle won't move a large building but it can move the materials.
Or you might make the castle out of colossal animated objects. Those can move, self-assemble and be healed.
Depending on exactly what climate and what geology it is - peat and coal burn. Various animal oils, especially whale oil have been used in the past.
Edit: marvelous pigments won't compare to a lyre of building.

Java Man |
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Stoneshape can be handy for repairs, you may not be technically able to repair damage, but if you can mold two sides of a crack together like puzzle pieces, you have restored alot of the break. With regards to wall of stone, placing two of them parrallel, and then filling the gap with rubble can make a thick wall quickly.

tonyz |

Summoning earth elementals to do lots of heavy lifting and digging. Or other big strong creatures, but earth elementals can glide through material and work on it from the inside.
Calling a powerful outsider who can grant wishes and just have a castle all at once.
Making a bargain with a really powerful outsider who can send lots of servants to do the building for you.
Unseen servant is very low-level but that means all your magically-capable followers can call one every day. They can't do fine work (nothing more than DC 10) but there's a powerful lot of carrying and laying in a fortress.
Don't forget wall of iron for reinforcing and plating sections of wall, and more creative permanent magical effects. In a world of magic, a fortress without magic is like pre-aircraft fortification after dive bombers came along.

Bwang |

Earth Elementals are my traditional solution, but in the campaign I play in, there are over two dozen additional spells I know of (not 'know') that deal with repairs and construction, plus a few that prevent such. Our combat types pay me to tote around some scrolls that neutralize rust monster mischief! Beyond that one, I have only a couple of ones of that type, but can not remember ever prepping one for an adventure.
Ask you GM if he has a secret trove of spells that aren't on the main lists.