"Not really," she admitted. "I only know what it wants. I don't know what it is or how it got there."
That was part of why Astor wanted so badly for Dexter to teach them - she and Cody, that was - about it. She knew next to nothing about it except that Dexter had said that they were too young and they couldn't understand; they would have to wait. That, and she knew that it made her want to hurt people; kill.
"I'm not supposed to talk about it because Dexter says only other people with it will understand. That it scares people or something," she added.