Great American cockroaches, colloquially called Radroaches, or Giant Cockroaches, are giant versions of the pre-War species that have been mutated by radiation. Cywren Caster has been killing them since she was a child. Cywren is alerted that they are in the area by means of hearing them "Shuffling around!"
- Jordan considers them Cywren's worst enemy.
- Ironically, due to defeating the Radroach king, Jordan considers Cywren to be their new leader.
- A Radroach was the first thing Cywren killed, when she was ten.