If you choose the major trait, the minor one is redundant and a waste of points.
No traits gets you nerfed versions of the ruins tech when you colonize the ruins.
Scavengers gets you regular ruins tech.
Xenoachaeologists gets you beefy versions of the ruins tech.
Oh, OK... I'll redo my empire file taking only one of the traits then! Thanks! Though perhaps you should clarify that in future versions / to the other players...
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