John half-smiled at the question and shook his head. "You definitely do NOT want to meet them. They're kind of. . ." He paused a moment, trying to think of how to describe the Wraith. "Let's just say I didn't use to believe in vampires, but after meeting the Wraith, that sounds perfectly reasonable."
He considered it a moment and then carried on. "They're this species -- one of our doctors thinks they evolved when some bug dna mixed with humans -- but they can literally suck away years of your life with their hand. It's how they feed."
He changed the subject quickly after that. Even in the quiet of the lake, it felt like a fairly heady subject to be talking about. Especially when everything was so peaceful now.
"Alright, maybe not THAT untoward," John said. "Although, I wasn't on all the missions, so I could be wrong about that," he said, grinning.