
Lakesidefantasy |

The Brothers of the Seven provided the Red Mantis with Vorel's Phage from which they derived Blood Veil. If you read Adventure Path #2: The Skinsaw Murders you will learn what Vorel's Phage is.
Vorel's Phage is a disease that resulted from a failed attempt at lichdom by a man named Vorel Foxglove. He was one of the founders of the Brothers of the Seven.
There's a lot more to the story, but if you read the Skinsaw Murders all will become clear.
This is why I like Paizo so much. They take a very long view with their storytelling.
The papers in the wreck of the Direption illustrate that B7 supplied Reiner Davaulus of the Red Mantis "specimens" of Vorel's Phage, and in addition they also passed ownership of the boat to him.
This connects the Queen's Physicians with the cult of Urgathoa, Reiner Davaulus with the Brothers of the Seven, the Queen with Davaulus, everybody's dying, cats and dogs are living together...EBOLA!
In the end this B7 thing just connects the two adventure paths but it is still fun to delve into it with your players.
I still don't know how the vampires figure into all of this; I assume they are just another cross pollination of Adventure Paths.