All mortals have an immortal spirit, but a mortal body. The Dragonborn is the same, only with a more powerful soul. Even Tiber Septim died of old age at 108 years. Only divine beings, liches (loopholes ftw), vampires, those infected with corpus, and daedra have immortal (not necessarily invulnerable) bodies.
Question: If i say Hellmouth is hundred percent correct, will I be accused of brown nosing again?