Enhanced Original Vampire is a term used to describe the type of Original vampire Alaric Saltzman became when Esther recast the Immortality Spell to turn him. She made changes such as binding Alaric's life to a human doppelgänger, whereas the other Originals' immortality was granted by the white oak tree. This meant that he could not be killed at all, as long as Elena lived, thus meaning even the white oak stake or the white oak ash daggers have no effect on him, as it will not even neutralize him. The only way he could die is if someone killed Elena, which is why he had to guard her life. His darker personality was enhanced as well, as Alaric's true personality is now gone completely, replaced by the psychotic vampire-hating serial killer that was created as a result of using the Gilbert ring to come back to life too many times, along with Esther manipulating his mind every time he died.