Apparently the fallen have 'fallen from grace' and seemed to be a once great empire.
Which sounds a lot like what happened to the humans; what if the fallen empire had been hit by the darkness (5th race, pyramid ships .etc), and are trying to get to the traveller to revitalise their old homeworlds?
In which case I will feel really bad for killing em :(
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The fallen. Plot twist-they are all the humans that were in all other major cities during the collapse. They died because of the darkness, and now they serve them.