Final answer:
The author's use of terms like 'drear,' 'raven-winged night,' and 'darkness' are examples of imagery that create a somber mood in the text.
Step-by-step explanation:
The terms "drear," "raven-winged night," and "darkness" used by the author are descriptive words that create vivid mental pictures for the reader. These terms are examples of imagery, which is a literary device that uses language to create sensory experiences. Imagery often appeals to our five senses and helps to build the atmosphere or mood of the narrative. In this case, the words chosen by the author suggest a somber or melancholic mood rather than one of optimism, joy, or light. Hence, when analyzing such descriptive terminology in a text, we recognize how the author paints a scene with words to convey emotion and setting.