If she was going to guess, and she is going to guess but she's not going to bet anything on it, the first diagram activates tikbalangs touching the medallion for the first time, and the second one lets them shift between various forms. Eventually she'll want either a bigger paper or a microscope rather than redoing those last several layers of cancellation by hand, but that can wait. Is there a number three?

Yup. It looks like a durability enchantment, on inspection.

She figured there would be one in there somewhere. It will be interesting to do a thorough comparison against hers later. She might start using this one for the invisibility jewelry, depending on how the comparison comes out; it's got to be public domain by now.

She sets the durability aside and pulls the next diagram, if there is one. Does faint burnination as a writing medium leave the backs of these sheets separately usable? Because if not, this is the last one she has enough big paper for.

If she burns onto the back of a sheet it might be readable but it'd take a bit more work to sort it out from what's visible from the other side. It at least doesn't burn clear through.

The next diagram uses forbiddance, control, and border.

She'll refrain from using the backs, then. A transcription mistake is just about the last thing she wants.

Forbiddance, control, and border, huh? Could be the part that restricts it to a single user, could be something else.

She'll start her analysis with the durability spell, as the most familiar and easiest to read. When she works out the math, how does it compare to the one she has, and how many more or fewer layers does it use?

She doesn't have it actual size, but it looks like it has one more layer than hers.

How much smaller did they manage to get the extra meanings with that extra layer?

She has no way to determine this because she does not have the diagram actual size.

Not even as a ratio, main meanings to residuals? 

There is one meaning (luck) which is a secondary meaning of one of the main runes, and appears to be cancelled only incidentally over the layers of the diagram; there's plenty of it left. The others are much smaller in ratio to the main meanings than hers.

Interesting, and a reminder that she should try making and investigating luck charms if she gets blocked on everything else. That's about all the analysis she can get done before Saturday and her string of appointments with critters potentially in need of healing. She packs up her magic rock and her waivers and heads to the Avalon.

Critters appear, mostly more or less on time, to be healed!

Everyone who's willing to sign the waiver gets to touch the magic rock.

Most of them barely look at it; one reads it all the way through.

That's pretty reasonable; they've probably all seen this kind of boilerplate before and there aren't any hidden catches in it. She's more interested in seeing how well they get healed!

The manticore's injury is improved. The diabetic's feet feel better but otherwise nothing is changed. The pregnant human is not improved. The nokk arrives very drugged and led by his son and the rock doesn't help at all.

She asks the manticore to pay her if he seems happy but doesn't push it if he objects. Given the couple of partial successes and the apparent go-to on the nokk, she thinks she needs 1) a higher-power version of this same rock and 2) something aimed specifically at mental ailments, except developing that sounds scary. Maybe also something that cures diabetes in particular, and similar specialized things.

The manticore pays up.

Cool. On the way home she buys a bunch more giant pieces of paper from the art store.

When she gets home she sends Bella the results of the healing attempts.

Also, my parents know about magic now, because when I got the first diagram off the Tikbalang medallion it overflowed the paper and singed both my carpet and my wall. They were way better about it than I have them credit for, once I offered to pay for new carpet. Anyway, watch out for that if you go to reverse-engineer anything.

That seems likely important, a huge amount of magic has to go into these things.

Yeah, if I do manage to reverse-engineer medallions it will probably involve renting an empty warehouse. In the meantime I think I'm going to do a larger version of the healing spell, it looked like it might have been running out of oomph. Maybe double the size and add another layer or two of cancelling.

You think you'd need a whole warehouse?

Some of the diagrams won't fit in my garage at the scale they need to be, and I still haven't seen all of them yet. Also, if I get to the point of mass production I'll want space to parallelize. But I'm just speculating; there might be rentable spaces bigger than a garage and smaller than a warehouse that would work better. It's all academic until I figure out what these diagrams did and how to reproduce it.

Space could be vertical if you got big shelves. Big airy studio apartment?

That could work. 

She puts the meanings from the healing diagram into the spreadsheet, then starts adding another layer of cancellation to the result.