This session was mostly all about returning to Blackreach and getting the rest of the crimson nirnroot (and, in the process, discovering that at least one bug in Skyrim does have a viable workaround!).
Wound up also having two different dragon encounters that resulted in NPC death and from which I rolled back. And I started the quest to get Volendrung as well.
See subject for the two main bits of action in this session: fetching the ingredients that let Quintus repair the White Phial in the last-ditch attempt to heal his master Nurelion, and then finding and rescuing Florentius from Ruunvald for the Dawnguard!
With this session, I officially got the Dawnguard plot underway! Found and rescued Serana at Dimhollow Crypt, and escorted her home to Castle Volkihar–with a stop along the way at Deepwood Redoubt and Hag’s End, where I confirmed that why yes, if you have Serana with you, you can in fact get the Ancient Shrouded Armor normally only available there if you’re in the Dark Brotherhood!