In "The Raven" by Edgar Allen Poe, external conflicts is the device that plays larger role. He uses it when he says, "'Get thee back into the tempest and the Night's Plutonian shore! Leave no black pump as token of thar lie thy soul hath spoken! Leave my loneliness unbroken!-quit the bust above my door! Take thy beak from out my heart, and take thy form from off my door!'" It plays a large role because it shows the anger toward the Raven and it gives hints of the sorrow he feels inside.
In "The Incident in the Rose Garden" by Donald Justice, imagery is the device that plays a large role. He uses it when he says "I watched him him pinch one loom off  and hold it to his nose- a connoisseur of roses- one bloom and then another. They strewed the earth around him." It plays a large role because the reader not only imagines this part and gets the feeling of a creepy character, but the reader imagines many other parts that make Death seem scary.