Requirements: CON 12
Ability Adjustments: CON +2, STR+1, CHA -1
Skill Adjustments: Combat +1, Contact -1, Technical -1
Metabolism: Iron Based
Arcturians are a Federation member species from a densely populated world in the Alpha Boötis system. They’re a militaristic people, valuing unity and discipline above individuality. Beyond military service in the Federation, Arcturian mercenaries serve throughout the galaxy.
Arcturians have reddish gray or purplish gray skin that droops in distinct wrinkles and folds, and deep set eyes. They have two sexes (though they’re often difficult for other species to tell apart), but Arcturians have given up sexual reproduction. Instead, all Arcturians are clones of a select few genetic lines.
Despite their military nature, Arcturians don’t revel in combat. Many display a degree of emotional restraint reminiscent of Vulcans, and they're often stereotyped as a dour people.
It’s unlikely the Arcturians' homeworld is the product of natural evolution: Their star is too metal poor. Federation scientists speculate that it was engineered by some super-advanced civilization in the distant past. Given their clone nature, some have speculated that the Arcturians themselves were engineered by this same race.
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Note: Arcturians just appeared in the background of ST:TMP and have never been featured prominently. They don't even show up in any of the Trek rpgs. What little information has been published about them comes from the costume designers for the film. See Memory Alpha.