How is Enceladus portrayed in the story?

Enceladus is one of the Gigantes in Greek mythology, huge giants who were born to Gaia. They fought the gods in a fierce battle, during which Athena killed Enceladus with her spear. He is portrayed in this story as he was in mythology - as a giant with scaly legs and dragon feet. The author introduces the idea that he was created specifically to fight Athena, which ties into the story of his original death.