Final answer:
The non-biblical description of Satan is 'C. Dark Lord,' as the other terms are found in religious texts.
Step-by-step explanation:
The question focuses on identifying which description is NOT commonly associated with Satan in religious texts or literature. The commonly known descriptions for Satan include A. ancient serpent, often associated with the serpent in the Garden of Eden, and D. roaring lion, derived from 1 Peter 5:8 which depicts Satan as a predator looking for someone to devour. Additionally, B. Angel of Light refers to 2 Corinthians 11:14 where Satan is described as masquerading as an angel of light. However, the term C. Dark Lord is not a traditional biblical description of Satan, but rather a term more commonly found in fictional literature such as in J.R.R. Tolkien's works or the Harry Potter series. Therefore, the description that is NOT associated with Satan is C. Dark Lord.