No, there is no connection with the valkyrie quest. No, you don't have to do it at all to complete the adventure. In fact I killed Adrianna and her bunch the first time I met them because I refused their quest. On the other hand you get a nice piece of story and a ring by accepting her quest, without freeing them. But if you've seen the story an are not partial to a ring that makes the game crash when you put it on, you can just as well skip it.
You give Boogre brew to vampires, they not nice and green yet. Perhaps then they friendlier to warm-skins.
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