Infermon is the Ultimate form of Chrysalimon. He has the appearance of a white spider with a red back.
When Beelzemon was destroying a swarm of Chrysalimon, Calumon enabled the remaining Chrysalimon to digivolve together into Infermon. Infermon blasted Beelzemon backward with Spider Shooter, but he jumped up and destroyed Infermon with Darkness Claw, absorbing his data.
- Spider Shooter - Shoots an energy wave from his mouth
- Infermon appeared in the movie of the first two seasons as a villain, and Diaboromon's Ultimate form. He skipped over the champion level Chrysalimon, which was first witnessed in this episode, The Imperfect Storm.