"Not much on a train," the Ascian murmurs, though there's at least some right here and now. Mostly dirt but he's working on increasing the rock population. An ability that would on pretty much any world be incredibly useful!

Free ranging water would be simpler, it's in the atmosphere itself, unlike rocks.

But there go ideas of free pest control, though if there's any pests around he hasn't really NOTICED yet. "I'm not sure I know that word as you're using it." Fandaniel glances back down at his stone, and the tiny motes begin moving again, albeit very slowly. "When you say 'familiar', what do yo mean by it?"