He is looking down at her peaceful, rigid face fading into the dusk as though darkness were a precursor of the ultimate earth, until at last the face seems to float detached upon it, lightly as the reflection of a dead leaf.
There are no more uses of "precursor" in the book.
Show samples from other sources
You mean all that was just the precursor?
Marissa Meyer -- Cinder
In a way, that terrible episode became not only the precursor but also the symbol for all the horrible viciousness that would follow.