Gunmar can be found at a radiant location. He says he's been hunting a bear for two weeks and he first wants to kill the animal to stop it from killing people. After helping him kill the bear, he'll head to Fort Dawnguard to see why Isran needs his help.
Sorine's Satchel containing seven Dwemer gyros can be found on the river bank nearby, about three paces south east towards the river near a tree rooted in the rock. Alternatively, any Dwemer gyro collected prior to meeting her will suffice. With a high enough Speech level, she can also be persuaded to go immediately to Fort Dawnguard.
After arriving at Fort Dawnguard, Isran tests both newcomers for vampirism by shining a beam of sunlight into the center of the entrance hall.
Gunmar: "All right Isran, you've got us all here. Now what do you want?" Isran: "Hold it right there." Sorine: "What are you doing?" Isran: "Making sure you're not vampires. Can't be too careful. So, welcome to Fort Dawnguard. I'm sure you've heard a bit of what we're up against. Powerful vampires, unlike anything we've seen before. And they have an Elder Scroll. If anyone is going to stand in their way, it's going to be us." Sorine: "This is all well and good, but do we actually know anything about what they're doing? What do we do now?" Isran: "We'll get to that. For now, get acquainted with the space. Sorine, you'll find room to start your tinkering on that crossbow design you've been working on. Gunmar, there's an area large enough for you to pen up some trolls, get them armored up and ready for use. In the meantime, we're going to get to the bottom of why a vampire showed up here looking for you. Let's go have a little chat with it, shall we?"
If the Dragonborn is a vampire, he won't grant membership until the vampirism has been cured and will suggest that Falion in Morthal is visited. This begins the quest "Rising at Dawn."
He tells Gunmar and Sorine about the current situation after clearing them. He will then summon the Dragonborn upstairs. The quest completes and the next quest, "Prophet," begins. The next time the interior of Fort Dawnguard is visited, Sorine and Gunmar will have changed into Dawnguard armor and opened up their shops as the general goods and blacksmith merchants, respectively.
I've rejected Harkon's offer to be turned into a vampire. Now I need to return to Isran and tell him what I've learned.
Objective 20: Speak with Isran
I've told Isran what I learned at the vampire castle. Isran has asked me to find Sorine Jurard and Gunmar, and bring them to him.
Objective 30: Recruit Sorine Jurard
Objective 40: Recruit Gunmar
Objective 50: Recruit Florentius Baenius
Objective 45: Help Gunmar defeat the bear
Objective 47: Speak to Gunmar
I've found the people Isran said we'd need to fight Harkon and his vampires. Now I should return to Isran and help him formulate a plan of attack.
Objective 60: Return to Isran
After rejecting Harkon's offer to become a vampire, I returned to Isran and informed him of what I've learned. I helped him recruit several people into the Dawnguard who can help us fight the vampires.
Solution: Wait 32 in-game days from the time you completed the Companions quest; the cave should respawn new bears.
There is a chance that the bears may never spawn in Cronvangr Cave. The only solution then is to reload the save before getting the quest.
PC 360 PS3 After recruiting Gunmar and Sorine and returning to Fort Dawnguard to talk to Isran, the raised gates will not lower and nothing will happen after Isran finishes his line.
Solution: Exit Fort Dawnguard and wait 24 hours.
Other possible solution: Shoot Isran with a crossbow or other weapon while hidden. He will not be hostile, the gates should go down, and the quest will advance.
Another possible solution: If the gates go up and the NPCs aren't in the center with you (which is a sign that the bug has been triggered), immediately leave Fort Dawnguard and reenter.
PC Sorine's satchel will not be on the shore at all.
Solution: Find 7 Dwemer Gyros in a Dwemer ruin or Fort Dawnguard and return them to her.
360 You are able to completely skip this quest if you don't return at all before returning to Lord Harkon a second time.
PC 360 PS3 The quest marker isn't shown while recruiting Gunmar. If Dragonborn is installed, then there is a chance that Gunmar is on Horker Island, just off the eastern shore of Solstheim, so he could be there.
There is a chance that going to Sorine before Gunmar, the quest marker may not show up.
PS3 Upon entering Fort Dawnguard, Sorine and the Dragonborn will be in the center of the room, and Gunmar will be outside the raised western gate. All Characters will go through their dialogue, and then nothing will happen.
Solution: Leave the fort, and immediately re-enter.
PC Upon entering Fort Dawnguard, the gates will raise, Sorine and Gunmar will not be present, Isran will be silent. After waiting, they appear, and Harkon is accompanying them, making it impossible to proceed.
PS3 Upon entering Fort Dawnguard, the gates will raise, Sorine and Gunmar will not be present, and Isran will not say anything.
Solution: Leave the fort, and immediately re-enter.
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