|“||I am Harkon, lord of this court.||„|
|~ Harkon introducing himself|
Lord Harkon is the main antagonist of Dawnguard, the first official expansion for The Elder Scrolls V: Skyrim.
He is the leader of the Volkihar vampires, who wants to block out the sun using the artifact known as Auriel's Bow and thus allow vampires to roam freely at all times. To do this, Harkon must also possess two Elder Scrolls and combine the arrows with the blood of his daughter, Serana, who is imprisoned at the start of the story but is freed by the Dragonborn early on.
He wants to sacrifice his own daughter so he can use all her blood to permanently block out the sun. Even the other vampires know that trying to permanently block the sun's light is a bad idea, and secretly want to see Harkon overthrown. No matter who you side with, whether the Dawnguard or the vampires, Harkon, in his transformed Vampire Lord form, is the final boss and must be killed.