Final answer:
The phrase 'shepherd of evil' could be a metaphor or personification, which are literary devices used in literature. The exact device depends on the text's context.
Step-by-step explanation:
The phrase "shepherd of evil" does not directly indicate a type of device; however, it could potentially be an example of a metaphor or personification depending on the context in which it is used in literature. These are both common literary devices where a metaphor is a figure of speech that implies a comparison between two unlike things by stating one thing is another, while personification attributes human characteristics to a non-human entity or abstract concept.
For a more precise and accurate explanation, additional context from the text referencing the "shepherd of evil" would be required to determine the exact literary device and its function within the work.