Valanda would have preferred to get a Milliways door somewhere more convenient, but Milliways is still pretty useful even if he can only go in by himself right now. He heads in, takes a seat at Bar, and orders a plate of Hylian food.
Valanda is familiar with this custom and waves back. "Hi, I'm Valanda, governor of Ira Sani. I'm a defense mage, which means I can make things indestructible."
"Griffith of Erlonn. I'm a druid, which means I can turn into a celestial smilodon and do assorted naturey things. If I may, what kinds of things do you make indestructible against what kinds of forces? I assume you couldn't, say, make an entire plane indestructible against the personal attention of an omnicidal deity."
"It's theoretically absolute, though I haven't tested it against a deity before. I do also have range and volume limits, and there's also specification issues – if I just make something fully indestructible, then it can't do anything, and looser specifications can pose issues against a determined and intelligent adversary. I could improve your armor, though?"
"I honestly doubt I'll still have any use for armor of the kind that blocks individual physical blows by being very tough by the time I'm ready to return home, which I'm planning to do when I have the ability to instantly win a godwar, but it wouldn't hurt."
He'll quote Griffith a price. It has the usual markup for Milliways customers, who nonetheless usually consider it a bargain.
"I am interested in your problem, I just don't have an immediate solution at hand with no further planning."
"Yes. It's a hard problem and I expect it to take thousands of years to solve, though if your protective enchantments are resistant to things like magically altering the truth value of their existence or can be used on truth values in general that would be the kind of thing that might be useful."
"Depends on how you define it? I've been here several times, but I don't get doors every month or anything like that."