"My people have been isolated from the greater galaxy for some time, and many of the specifics of what had occured had been lost to the mists of time." You take a sip of the offered drink. "Few were candidates for what we had referred to as the Rite of Becoming, and with all the dangers on the edge of the Rift, few would acquire much experience, especially when the most advanced tools on hand until relatively recently were those of hand-forged steel, which made armour maintenence something of a trial."
You considered coming up with a more elaborate story for a while, one that played to their preconceptions, but you tossed it out shortly before the determined meeting--these weren't people who assumed their first guess was accurate, and you would simply end up revealing the depth of your information network, and likely be presented as an enemy.
"Not impossible mind you, but it was very much a master-to-apprentice routine we had going for us. I just happened to have the good fortune of discovering where the ancient ship was, and took the secrets kept within to begin developing the planet to something more respectable." You grin at that. "Of course, that also leaves me in nominal control, but the way I see it, the alternative was some charismatic overlord with more ambition than sense to try setting up camp, and my people had suffered enough by then, and we had lost enough of our brothers and sisters to those raiders from the stars."
A fair story, well coordinated to explain your capabilities, while leaving just enough wiggle room to handwave off any discreptancies that might have shown up, with the whole thing on the Citadel a few centuries back. Even if you didn't leave any bodies behind, and few would have gotten a good look at you and Lilith, it was still just good sense to cover your bases. The Gods liked attacking through those angles anyway.