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I've never gotten to cast it (not yet anyway)
The biggest problem with casting Mighty Fortress is that you need a game to go to 17th level so you can learn Wish
Yes, I know it's an 8th level spell, but if you think that I'm coughing up a diamond for a temporary home you're out of your mind.
You can make it permanent if you cast it 53 times, and by the time you hit level 15, 500gp for a week of downtime with comfort and security is occasionally worth it. Our druid/cleric regularly casts greater restoration rather than wait for me to prepare remove curse the next morning.
Yeah, fair enough. Casting it enough to make it permanent would be 26,500gp. Which isn't a tiny amount in a general sense, but by level 15 it shouldn't be a major amount of gold honestly. I'd be more concerned with finding that many diamonds frankly.
Still better than the 50,000 gp construction cost and 400 days for a "Keep or small castle" using Building a Stronghold. Actual time spent on labor amounts to a minute per week for a high enough level wizard.
Next episode: The gang secure themselves a mine to gain a steady supply of blood diamonds.
Ten sessions later and the party has complete control of the diamond market. The Barbarian names their mine after his favorite thing, and that's how the My Beers Mining Company starts.
One session after that, they find out that the continental cartel has had decades to entrench their position on the market and can and will field all the manpower that dozens of diamond-producing national branches can field in order to regain control of one lost national mining branch. Two sessions later, the alchemist is the one who knocks.
I unironically wanna play this campaign now I'm not gonna lie.
I won't stop you :)
It would make a great homebrew item with a finite # of casts inside, though, as a key pre-boss prep staging...
You don't even need to homebrew. Spell scrolls exist. It's not unreasonable to think a spell scroll of mighty fortress would be stored away for safekeeping somewhere for a long time before the PCs find it. 👍🏻