Thoughts on the Waystone Project going forwards:
The Rune... I suppose we could have Mathilde learn Arcane Khazalid to see if she can pick up on any connections the Runesmiths might not be able to? That or we could go do some hunting in Lustria for more Old One Script?
There's some obvious potential with the Gold Order and the capstone metal. If we plan on investigating that, I think it makes sense to fully bring the Gold Order in on the same turn we do. If we stick with just "giving Johann and Max authorization" then it probably won't cost much either, as opposed to if we tried to hire a new Gold Wizard specialist. It's also worth noting that we have a Major Boon from the Karaz-a-Karak Metalsmiths Guild since we personally rescued a ton of them, which we could likely parlay into either them giving us guidance if we end up stumped, or into having them supply us with a bunch of Waystone Gold if we figure out the recipe ourselves.
The foundational wheel... seems somewhat similar to Thorek's device for recharging Anvil Runes. Beyond that, just discuss Wind theory to try to pin down an underlying truth? Get some texts from Cathay or Ind for extra insight?
Leylines - this is where the Amber Order comes in, I don't doubt that they could help us fill in our speculative map a great deal. A bunch of field excursions too, to see what the situation in Sylvania and Mouslion are like.
Tributaries - a lot to talk about with the Hedgewise here. Likely worth bringing in a number of other cults that we think might retain historical knowledge of tributaries. Probably need to bring in the Ulricans first for political reasons.
Other Networks - since I doubt Athel Loren or Nehekara are sharing, this is gonna rely heavily on what and how much Zlata decides to share.