I think this DLC might involve Werewolves too, look at the bottom left of the picture. The Dovakhin has some scars, ut it looks like they might actually be some sort of tattoo or something, to me it looks like the werewolf symbol for the werewolf perk tree from the Skyrim game jam. Maybe Dawnguard has to do with the Vigil of Stendarr protecting Skyrim from "night creatures" like the Falmer, vampires, and werewolves and they're guarding the dawn. And when I think of crossbows I also think of Van Helsing with his stake launching crossbow