A trait that you can take that will add a special N.P.C. to all spawn lists, these N.P.C.s will be automatically hostile, wield swords, and will recover from any injury that isn’t a head-shot from a bladed weapon, but the player will similarly recover from most injuries and gain +.01 speed from each one that they kill. Oh, and they should say “there can be only one”…
All the great villainous artificial intelligences should be randomly in control of labs and be constantly going to war or allying with each other. So a Hal 9000 lab might send a band of robots to attack a Skynet lab and the Glados lab will helpfully suggest that you might want to nuke the Shodan lab…