Have you ever introduced new alien species in your EP campaigns, either homemade creations, or stuff from games or novels?
I love the factors because they're really "alien" aliens, but this also makes it difficult to do them justice. For our current campaign, I'm working on converting the pentapods from [b]Traveller 2300AD[/b] to EP. I'm hinting at a connection / rivalry between them and the factors, and they work pretty much as written - they even have their own versions of forking and resleeving technologies! So far, I came up with stats for bishops (pentapod combat constructs).
I guess the aborigines from [b]Blue Planet[/b] would also fit the bill.
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[i]"You're gonna carry that weight"[/i]