Then was there a barrier which Garr Symm, along with all humanoids, had somehow inherited?
The aliens had developed a union of their own—if anything, a stronger one than the humanoids had.
It was one of the frigid, musty tombs that the humanoids called home.
One of the humanoids fell without a cry, pitching senseless over the ledge.
This is their barrier, erected against you, against all humanoids, a million years ago.
Our ancestors thought so, and even planned to attack her, before the humanoids defeated us.
These humanoids had large mouths and sharp teeth, and they unquestionably slavered.