You return to Laurelorn with Eltharion, you in your Gyrocarriage and him atop a majestic Griffon called Stormwing that draws all the attention that your Gyrocarriage usually gets and then some. When led through the headquarters of the Waystone Project he examines all the prototype components with a blank face, his soul churning with Shyish as he consults whoever or whatever he consults. He takes a copy of the ritual for Liminal Germination immediately after it's described to him - it seems that nearly all of Ulthuan is covered by something equivalent to it, though not always forest-themed, and it would be directly applicable in some places and hopefully easily adapted in others.
Your efforts at grappling with the Leyline problem seem to fascinate him the most, and he spends some time scrutinizing one of the bags of rocks, by force of will alone remaining resolutely unbaffled. He listens to your theorizing on the Titan-metal used in the original capstones, and confirms that the Kingdom of Caledor would have the ability, though not necessarily the inclination, to make more of the stuff. Though he doesn't outright say it would be expensive, it's implied enough that you're happy you considered the alternatives.