Terezi has to think hard about that one. Sollux never talked much about it. Whenever he did, he was always vague about it, like he really didn't want to go into detail. It had always made her curious, but never enough to warrant causing him discomfort.

"They are usually from lower castes: yellows and reds. They're assigned to ships based on their psychic ability. Beyond that...Not much else. One of my best friends was a really powerful yellowblood, but he never wanted to talk about what would happen when we joined the fleet."