Located Valerica, Serana's mother who sheds some light on the history of vampires and the kinky nature of Molag Bal which may explain why she has such a fascination for boners *cough* skeletons. Anyway she's trapped in the boneyard (rofl) and needs us to go slay the keepers that are powering the force field. These three headless bosses are impressive in their dragonbone gear but not really difficult to defeat. The last one was the easiest, I threw him from his floating tower and took his bow.
With the shield down we finally claim the elder scroll from Valerica - after easily beating up a dragon that lurks down here. The draggy is surprisingly resilient to death though, and we have a chat later where we exchange names: he calls me Vanquisher, I call him Dummy. We're cool. Though Serana wants to leave now that we got what we came for, I decide to finish off this zone thoroughly so I won't have to come back which means spending hours looking for pages of "Saint" Jiub's book. Goddamn.
I found the skull of a dead horse (who I can't summon due to lack of magicka), the shards required to awaken the reaper (total pushover), and the gem with part of my own soul before I found all ten pages for the fool. Fortunately his reward for it is a really awesome amulet which almost makes it all worthwhile. We then hoofed it back to the land of the living and instead of heading back to Dawnguard HQ decided to do some quick quest detours on the way back starting with stealing some schematics from the falmer beneath Markarth.
Why don't you obey me?
Using Whirlwind Sprint made this an incredibly quick task for me since I could jump across an inconceivably large gap to the main control chest right away. Serana on the other hand seemed content jumping off the highest ledge into the falmer infested ruins and zapping her way out. I didn't really concern myself since she was evidently very capable in combat. She also has more personality than most of the NPCs, making me kinda wish Bethesda had a few more people with this much depth (and it's not super deep at all).