Dear Galvatron, a while back someone asked if Unicron would ever create his own dark primes to counter Primus's Thirteen. Vector Prime said that Unicron wouldn't because creation was Primus's thing, but seeing as you're to spilling Vector's secrets, perhaps you'd know if a group of "Dark Primes" exist.
Vector is a fool about many things, but here at least he tells the truth—or at least, a white lie. Unicron lacked even a hint of a creative spark; his one great creation was the Mini-cons, but even they were originally envisioned as existing in his image, like Dead End. Now with Vector's knowledge banks, I can see that pattern repeated throughout the cosmos: the Egg Beasts, the Sparkbots, the Cyclone Mini-Cons... it speaks to a perverse form of narcissism.
His one attempt at creating his own "Dark Prime" ended up a sparkless beast, and even that was a mere copy of Optimus. No, when Unicron wishes for a servant, he will always corrupt rather than create, molding a Nemesis Prime servant from a former Autobot "hero"—this has been known since the tales of old, but I see now that the likes of the Fallen are more than just legends.
I can also see why Vector was reluctant to share this information. "Nemesis Prima?" I shall have to seek them out sometime.