[1] Coriakin was originally a star, who, as reparation for past misdeeds was charged by Aslan to rule the Duffers and guide them to wisdom.

After perusing a few other distracting spells, Lucy makes all things in the magician's house visible, including Coriakin and Aslan himself.

Lucy soon sees the magician as a kind, wise fellow with a good sense of humor, hardly the terrifying sorcerer the Duffers made him out to be.

He suggests that Lucy try to convince the Duffers that their new appearance is nicer than their former one, which she succeeds in doing (they also find advantages in their new condition, such as using their giant foot as a boat or as a sun umbrella).

The story of their transformation into Monopods was likely self-deprecating on the part of the author: Lewis was born with only one joint in his thumbs, which impeded his physical activities and resulted in him becoming a writer.