Beyond Death - p. 2 | Dawnguard path TES V: Skyrim - Dawnguard Guide
Last update: 11 May 2016
New primary objective: Retrieve the Scroll and return to Tamriel
After it disappear, speak to Valerica and take the nearby Scroll. You need to return to Tamriel by following the same route by which your came here.
The woman will also tell you where the gem in which the part of your soul is trapped can be found, assuming you didn't want to change into a vampire.
After you leave the square, you will meet with Durnehviir once again. The dragon will teach you a Shout thanks to which you will be able to call him to aid you in battle. Bid the beast farewell and go find the soul gem.
It can be found north-west of Valerica's former prison, inside big ruins with a rock flying above.
Defeat small skeletons groups inside and find a purple teleport. It will take you to the upper floor, where you can find a chest with the stone.
You need to take it as fast as possible, as the stone above deals quite a lot of damage.
After you finish the mission, return to Tamriel through the portal by which you came here.
From Valerica's lab, you can head onto the balcony and from there to any part of the world with fast travel.