((Holy crap, the 500 tons thing piqued my curiosity so I did some calculations; sure enough, that is a massive quantity of stone. I'd just been thinking of volume, and specifically volume in number of cubic meter blocks, so I hadn't realized just how much stuff I can make.
Now if only we had some stonecrafters. Do we have stonecrafters? The economy would explode. Assuming everyone living in a cave really really likes stone mugs and rings, that is.
Man I like conjuration.))
Sorry to get your hopes up, but I thought about how powerful that could be for a level 1 spell. I'm changing the limit to 35m^3 until you do research to raise that limit.
Of course, that's still nearly 100 tons of stone, so it probably won't make much difference unless you're trying to summon fortresses as soon as possible.
No stonecrafters, but there are artisans who could pick it up soon enough given limitless raw materials.
(Questions:
This sound recording... Does it record 2 days and then stop forever or is it rewriting the track over and over? If the former - can caster erase it and restart recording? Oh, and can any other caster who knows that spell link to the divining stone created by another caster?)
You can save what you want, then have it rewrite everything else.
Anyone who knows the spell can indeed link to it. Really, anyone could try, but they'd have pretty bad chances without being decently skilled in divination and/or metamagic (And you'd likely notice the tampering eventually). I'm not sure how much it would cost, but probably around 10% of the normal cost. Their cost to view it would be independent of yours.