he is dreading the loss of his loss Lenore. "Once upon a midnight dreary, while I pondered, weak and weary, Over many a quaint and curious volume of forgotten lore" (Poe 312)
supernatural or other worldly elements
when he opened his chamber door after hearing a taping, there was only darkness. "Deep into that darkness peering, long i stood there wondering, fearing,".(Poe 314) "And the only word there spoken was the whispered word, Lenore!"(Poe 314)
macabre or violent incidents
tell me truly , I implore - Is there - is there balm in Gilead?
There was a tapping at his window and its not just the wind. "Soon again i heard a tapping somewhat louder than before. Surely, said I, surely that is something at my window lattice; Let me see, then, what thereat is, and this mystery explore" (Poe 314)
characteristics in physiological and/or physical torment
Leave my loneliness unbroken! - quit the bust above my door!
The fact the the bird is saying nevermore is supernatural. "Quoth the raven, Nevermore" (Poe 314)
Tell me what thy lordly name is on the Night's Plutonian shore!
He will not find peace from his grief. "Respite - Respite and nepenthe and forget this lost Lenore! Quoth the Raven, Nevermore" (Poe 315)
Never going to have peace from the death of his lost Lenore, and the Raven always quoting nevermore. "Leave my loneliness unbroken! - quit the bust above my door! Take thy beak from out my heart, and take the form from off my door! Quoth the Raven, Nevermore." (Poe 317)