The Crystal Basilisk has both avian and reptilian biology. It has the back half of a lizard, and it appears that its front half had feathers, as Lion coughed out feathers when he was eating one. It is named after the faceted, crystalline dorsal spines growing on its backside.
- It is not a Corrupted Gem, as it has a skeleton, didn't poof and has no gem.
- Another half-eaten Crystal Basilisk appears in Issue 6 of the comic book series, in the story "Lion's Share".