Dawnguard | Factions side quests TES V: Skyrim - Dawnguard Guide
Last update: 11 May 2016
Introduction
Depending on which faction you joined, you will be able to access one of two location: Fort Dawnguard or Castle Volhikar. In both cases, by speaking to its inhabitants you can receive various additional missions, the order and goals of which are mostly random. Below I will try to describe all the tasks, though without going into details and naming given dungeons or items, as they are prone to change. With the exception of Bolstering the Ranks, which always plays out the same.
Bolstering the Ranks
New primary objective: Speak to Isran
This mission will become available right after you complete Prophet. Find Sorina Jurard in Fort Dawnguard and speak to her. The woman will suggest that a certain Florentius Baenius could join the brotherhood. Speak to Isran about it.
New primary objective: Find Florentius
The man has been last seen in Ruunwald Excavation located north of Riften. Before going in, take the journal from the nearby tent.
Keep going onwards inside, killing all the enemies on your way. At the end you will find a door leading to Ruunwald Temple.
Inside, in a big room, you will be attacked by a group of enemies led by a mage Minorna. You should eliminate her in the first place.
Beside her dead body you will find a key to Florentius' cage.
Free the man and speak to him to convince him to head to Fort Dawnguard. That way you will finish the mission.
In order to leave the location fast, open the door in the south using the recently obtained key. The corridor behind will lead you to the surface.
Lost Relic
After completing Bolstering the Rank, speak to Florentius in Fort Dawnguard. The man will ask you to retrieve an ancient artifact which can be found in a random dungeon. Usually it's at the end of tunnels.
Ancient Technology
Sorine Jurard will ask you to find a special schematic which will let her improve your crossbow. It's mostly found in dungeons filled with vampires. Defeat all the enemies, take the item and return to Sorine to collect your prize.
Hide and Seek
You will receive this mission from Gunmar. The man will ask you to kill a vampire who pretends to be human. You can kill him in front of guards, but you will have to pay a fine or end up in prison, so a silent assassination is a better solution. If you find your victim in a crowded place, ask/order him to follow you and head to a secluded place to finish the job.
A Jarl's Justice
Isran will tell you that a vampire has infiltrated one of the Jarl's courts. You have to kill him before the can threaten the lord. Before you do it, you however have to steal a note from him (Orders). If you show him to the Jarl, the guards won't interfere when you attack the spy. Otherwise you will be thrown into jail or have to pay a fine.
Dawnguard Rescue Missions
From Florentius you will learn that one of the people close to you has been kidnapped. You need to head to the marked location and save the man/woman. You will most probably find him/her inside a cell guarded by a group of enemies. Once they're all dead, pull the lever to open the grate and end the mission.
Preemptive Strike/Cleansing Light
This mission received from Gunmar is very simple. You need to head to the marked dungeon and kill the Master Vampire there. He will be most probably protected by other weaker vampires, but overall the fight shouldn't cause you a big trouble.
Hunting the Monster
Gunmar will ask you to head to town and ask a certain person for the whereabouts of a vampire. During the conversation you will have the option to bribe, intimidate or persuade the human to give you the letter with the beast's location. If the persuasion attempt fails, you can always try to steal the letter. Afterwards head to the described location and kill the blood sucker.