Walkthroughs for the quests from Helgen Reborn, a user created plugin for Skyrim.
This quest starts partway through Desperate Times, after Falco, who is dressed in Imperial armour, enters the room where Val and Marcus are talking.
Free him by activating the shackles, and he will fall to the floor. Falco will tell Cienna to help him, which she does by healing him. Falco, Cienna and Korst will chat, updating him on the situation and who you are, and Korst will then retrieve his gear from a nearby Chest.
This completes the quest, so return to Helgen Keep with the three of them, although you may want to do a bit of looting first. As well as Coin Purses, Chests and potions that can be found around the place, most of the Thalmor gear is valuable. There are also three skill books; the Two-Handed skill book Song of Hrormir in the lower level and the Smithing skill book Heavy Armour Forging and the Archery skill book The Marksmanship Lesson, as well as the Spell Tomes Soul Trap, Storm Thrall and Thunderbolt in the room where Halindil was when you first entered. You can now continue with Desperate Times.
The details of this quest series vary slightly depending on whether you chose to join the Stormcloaks, the Legion or to remain independent. The names of the troops who accompany you on the various missions changes depending on the side chosen.
Once all the recruits have been gathered in Desperate Times and Korst has addressed them speak to him and say that "I'm ready to begin evaluating the recruits." If the Imperials or Stormcloaks have been chosen, Shadrick Oaken-Heart will say that his troops have got bored and restless and need taking into the field, whilst for the independent troops they need evaluating. This will starts a series of identically named side missions.
At the end of each mission, Korst will ask you to evaluate the soldier you took with you. You can be complimentary, or not, about their abilities; it doesn't appear to make a difference, so you may as well say nice things. At least they can't die, which makes them useful as a distraction if nothing else.
The first mission Korst asks you to do is to take Wanan-Dunn, Surus or Toralf and go and clear out a vampire lair.
"A group of vampires has taken over Shriekwind Bastion and have been kidnapping travelers along the road by Lake Ilinalta. Korst has asked me to take Wanan-Dun/Surus/Toralf and eliminate the threat."
Go and find Wanan-Dun, Surus or Toralf, depending on which faction you chose, independent, Imperial or the Stormcloaks, and tell them to follow you.
Shriekwind Bastion is a Nordic ruin north of Falkreath occupied by Skeletons and Vampires with two entrances. Enter the ruin via North Shriekwind Bastion. The ruin is more dangerous than it would normally be, as eleven Vampires have been added. A new area, Shriekwind Sanctuary, has also been added, and this is the area that needs visiting.
The following applies when entering through North Shriekwind Bastion. This instructions only deal with the path to follow; there are many monsters along the way, which will oppose you. Enter Shriekwind Bastion and unlock the Iron Door. Go through the next chamber and up some steps to a chamber with a Handle. Go up some more steps and through another Iron Door, then up more steps to a chamber with an open roof and an Iron Portcullis. The Portcullis is opened by a Chain at the top of the steps by the entrance.
Pulling the Chain opens the western Portcullis in the main room. In the chamber revealed are two Draugr and another Lever; this Lever opens the second southern Portcullis. The new room has a third Portcullis and another Chain; activating the Chain opens the eastern Portcullis in the main room to another small area with two more Draugr and another Lever.
This Lever opens the third and final Portcullis to the south, beyond which is an Iron Door. In the room beyond the door is the Master Vampire who needs killing to complete the quest, as well as a levelled Vampire and Vampire Thrall.
"The vampire threat has been eliminated. I should return to Korst and give him my report."
Return to Korst to continue with the next quest, Brittleshin Necromancers.