Sir Chaos wrote:
I can see one problem, though: Assuming your second alien species was starfaring, how come they have not picked the region clean of all reasonably accessible Artifacts?
The Visitation might be relatively recent, as it was in Roadside Picnic
(the main inspiration here) - after the "comprehensible aliens" were gone. This is what I am thinking of...
Or the Visitation happened while the comprehensible aliens were around, they were "struck by the divine fury of the gods" (i.e. had their figurative anthill accidentally run over by the visitors´ car) and avoided the Zones and Artifacts like the plague from then on.
Or the comprehensible aliens had their own visitation before their rise to interstellar expansion and gathered their own set of Artifacts - nobody says the visitors can´t vacation in the same spot twice!