The questline forks at ' Bloodline,' where allegiance between the Volkihar Clan and the Dawnguard must be selected. A few repeatable, radiant quests can also be completed.

Twenty-two quests featured in the plug-in twelve exist in the main quest, with several optional side quests. Introduced in Dawnguard are two unique skill trees, one for vampirism noted as ' Vampire Lord' and one for lycanthropy. Skyrim's Dragonborn protagonist chooses whether to join the Dawnguard and prevent Nirn from being plunged in irrevocable night, or assist the vampire coven with realizing their malevolent ambition. A legion of vampires known as the Volkihar Clan, lead by Lord Harkon, seek to actuate the prophecy by performing the ritual the Dawnguard, a faction of crossbow-wielding vampire hunters counters their aims. Foretelling the eternal obfuscation of the sun, the scroll gave instructions on how to perform a magic ritual with a mythic bow and a special blood sacrifice.

Released first for the Xbox 360 on 26 June 2012, and later on 2 August for PC, Dawnguard revolves around an ancient prophecy predicted by an Elder Scroll. The Elder Scrolls V: Dawnguard is the first official add-on for the fifth installment in The Elder Scrolls series, Skyrim.

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