Ptyron is the Specialist Crogenitor on Cryos. During Zrin's Story, Ptyron is supposed to be huge: "A towering creature unlike any he’d ever seen appeared inside his cell and touched his head. Zrin writhed in agony, feeling his body surge with unbearable heat, as if from the skin of a star. And then the super-being--Crogenitor Ptyron--vanished as if he’d never appeared." Like all other Crogenitors (Besides Zelem), Maxis never revealed a picture of him
- According to his role in plasma hero bios, he appears to be the kindest known crogenitor, because of his role of always giving heros their powers out of pity for them.