Seems like a reasonable idea, though it would probably be easier to find a location where a leyline intersects an existing mine, rather than drilling our own hole, unless they're a lot shallower than thought.
I'm not Hydroplatypus or deathbybunnies, but I personally didn't read this as 'check Cadeath's work because we don't trust her', I read it as 'huh, I wonder what kind of neat stuff happens to the stone and soil that the Leyline actually occupies/passes through?'. While I'm sure we'll get to this in the Leyline mapping action, I'd imagine a Leyline that intersects the open air to look like a spring of magic, much like an aquifer intersecting the air looks like a spring of water.
So generally, I think of the Winds as semi-sentient flows of water. Liquids with preferences and a loose relationship with gravity.
With that in mind, here are my thoughts on the subject.
1) Stone is an excellent insulator of magic.
Another way to put this, however, is that stone is magic (semi)permeable. For a mental model with real substances, consider water and clay.
2) Winds want to be where
the people Interesting Things are.
In the absence of other factors (sufficient Willpower manipulating them, density differentials, etc etc) Winds will gather around objects that resonate with them. To read a bit more into what Cadeath said, if the Lornalim don't shunt them deep enough, then they wriggle back out of the stone and soil to re-coagulate around their nucleation points.
3) Winds are picky and lazy.
If they like where they are, they'll stay there (positional inertia?). If they don't like where they are (or would like somewhere else better), they'll try and fix that.
So we can arrange a hierarchy of Wind-attractiveness as follows (as best I remember)
The Vortex*1 > Nexuses > Waystones > Leylines > Tributaries*2 > Dhar*3 > Enchanted Objects > Resonant Objects >*4 - Stone
*1 - Which is presumably the impetus behind Winds vastly preferring to flow underground along cardinal directions
*2 - Note: this is the empty-wind attractiveness quotient, i.e. how much a Wind wants to occupy an empty space. This is, I think, literally how a Tributary functions (with a one-way Leyline dump at the bottom).
*3 - Note: Dhar is
exactly as attractive to a Wind as any two Winds are repulsed by each other.
*4
- This one isn't really an attractiveness gradient per se, but Winds really seem to dislike Stone/Mountains.
Working questions:
Are Resonant/Enchanted Objects
actually more or less attractive than Tributaries? Test: put a saturated object, then a basic enchanted objected on a tributary, check in a day or two to see if they discharge (or more immediately, see if the plants touching a tributary are healthy but empty/less saturated with Ghyran than usual).
Why can Ghyran be pulled out of/sourced from stone, as in that scene where Mathilde told Pan how she finds a big Magic stat attractive? (surface-exposed stone??)
What actually happens to the stone along a leyline? Does the constant friction of Winds passing through it render it magic permeable over time?
Apologies if this feels like a rehashing of other discussions, I just wanted to collate our metaphysical puzzle pieces so far, and put out a couple questions for future turns/action plans. I feel like we have some important corner pieces, and half of the colors of the box picture. And that's pretty good!