The Blood Elder Scroll is a quest item in The Elder Scrolls V: Dawnguard, in which it is central to the main quest.
This Elder Scroll was originally in the possession of Valerica, Lord Harkon's estranged wife. She took it from Castle Volkihar sometime in the early First Era and fled to the Soul Cairn so that Harkon could not complete the Tyranny of the Sun prophecy.
The Dragonborn must travel with Serana to the Soul Cairn to confront Valerica and obtain the Elder Scroll.
The Dragonborn is required to read the Elder Scroll at Ancestor Glade in order to locate Auriel's Bow.
If the Dragonborn sided with the Dawnguard, the scroll, along with the Sun Elder Scroll, can be sold to Dexion Evicus for 6,000 after completely finishing the main quest.
- When travelling with dead thralls, if the scroll is read, they might die.