Ive always wondered whether the traveler visited the other races, raised them to intergalactic level then left, at which point the races society collapsed, and so they chase the traveler, each time a new race is added, till the caught up on earth, and tried to force the traveler back. It would explain why they have neither destroyed the traveler completely, nor returned to their origin space. Also would make sense why these 'minions of darkness' fight each other. The nine might be the remnants of one of these races who choose less direct methods to get what they want.
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Could be that pal, i kinda think there is somthing more sinister about the traveler, sure he bought technology and knowledge threw the galaxy, but what is it he took in return?, something is very wrong about the traveler and the speaker, i think he consumed what ever he needed then moved on to the next planet and this is how the out ring planets became in the darkness