[Talnissa's]

"We never really knew. The people who did it had all become some of those energy beings, most of them refused to have anything to do with us, and didn't allow those who would to tell us very much of anything. We think they were designed as a bioweapon against something even worse than they were, but they escaped the lab prematurely, went off the reservation and wound up destroying their masters."

Kara chuckles sardonically. "It probably says something for 'sufficently advanced intelligence' that the second try at a sentient bioweapon, this time to kill Wraith, produced remarkably similar results. They were easier to deal with though. Thankfully."