The serpent (nachash) was an image commonly used in reference to a divine throne guardian. Given the context of Eden, that helps identify the villain as a divine being. The divine adversary dispenses divine information, using it to goad Eve. He gives her an oracle (or, an omen!): You won’t really die. God knows when you eat you will be like one of the elohim. Lastly, a shining appearance conveys a divine nature. All the meanings telegraph something important.
