Quote:
Originally Posted by Kromm
Someone who can work iron into a durable door of good temper and reasonable resistance to the elements – strong, corrosion-resistant alloy steel – at TL Olden Times . . . without using a shred of magic.
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You're missing the obvious one - you make the door out of mundane iron with all the magic your twisted heart desires. You then put it in a highly-protective shell and teleport it outside the atmosphere, far enough for the shell to become incandescent during re-entry. It falls back down, and you use some more magic to slow down the shell safely. By definition, the door is now iron from a meteor - that is, meteoric iron - and is impossible to affect with magic. Given, that's a lot of setup just to have a mage-proof door, but might not be as expensive as crafting a giant iron door at TL 3-ish
without magic (and sourcing enough meteoric iron for the endeavor).
But, yeah, ISTR a story of an exasperated GM from That Other Game who made Adamantium doors or something similar, and was rather upset when the party of delvers opted to remove those from the hinges and cart them away, making a
far greater profit than was intended (the doors being worth markedly more than all the rest of the treasure in the dungeon combined).