Preemptive Strike

Walkthrough
The ever vigilant Gunmar at Fort Dawnguard is aware of certain Nightmaster Vampires about to turn their allies. This could become a huge problem for the Dawnguard in the future, best to act early on.

Kill the  at 
Travel to the indicated bandit camp or warlock lair and take out the vampire along with any of his allies there.

Examples:
 * in Broken Helm Hollow, reward Circlet of Peerless Illusion.
 * in Hrodulf's House on Solstheim, reward Scaled Armor of Destruction.
 * in Bloodskal Barrow, reward Elven Bow of Expelling.

Return to Gunmar
Return with the good news to Gunmar who will reward with an enchanted item.

Since these are Radiant (randomly generated) quests, this quest can be repeated endlessly. Präventivschlag