Vampires and Werewolves

From the introduction: The party comes across a minor skirmish between a part of vampires and a pack of werewolves. Each group is small and the battle could go either way. The party could support either side, in which case, a surviving member is willing to talk to the party, explaining their group’s aims and structure. The party could support neither side, destroying or ignoring them, in which case a third party, most likely a clued-in police officer or priest, contacts the party later.