Callista is the daughter of Elaine and Max who receives the second skin in vivo. It misinterprets her infancy as a condition requiring healing. As a result, she matures incredibly fast, becoming conscious in the womb and teleporting herself out of her mother’s body at one point.

She rescues Max in Book Three by helping him fight Aggregar (Lord of the Assemblers), and goes on to play a pivotal role in Book Four at which point, chronologically just over one year old, she already looks and acts like a 20-year-old.