Anyway.

The way this actually works is that when a new planet acquires enough of a population to start popping clerics, Valmallos visits the place, looks it over, and figures out some substances that ought to be difficult to mine, harvest, or compound and refine.

These then get defined as incense.

Gods then grant their clerics, on that planet, spells designed to require that sort of incense.

Anyway.

The way "this spell needs 25gp of incense" actually works is that when a new planet acquires enough of a population to start popping clerics, Valmallos visits the place, looks it over, and figures out some substances that ought to be difficult to mine, harvest, or compound and refine.

These then get defined as [incense].

Gods then grant their clerics, on that planet, spells designed to require that sort of material being simultaneously destroyed nearby.