Skyrim:Darkness Returns

Quick Walkthrough
# Enter the Twilight Sepulcher.
# Speak to the Nightingale Sentinel.
#* (Optional) Find Nystrom's Journal.
# Follow the Pilgrim's Path.
# Unlock the Ebonmere with the Skeleton Key.
# Listen to Nocturnal.
# Speak to Karliah.
# Choose a Nightingale blessing.

Detailed Walkthrough
The Twilight Sepulcher
thumb|right|Gallus's spirit guarding the entrance to the Twilight Sepulcher
Once you enter the Twilight Sepulcher, you will come to a large hall where the spirit of a Nightingale Sentinel stands watch. When you approach him, he will initiate a conversation:

''"I don't recognize you, but I sense that you're one of us. Who are you?" 
''"I'd ask the same question of you."'':  
"The last of the Nightingale Sentinels, I'm afraid. I've defended the Sepulcher alone for what seems like an eternity." 
"The last? What happened to the rest?": 
"We were betrayed by one of our own kind. In fact, I'm to blame for what's happened here." 
"How are you to blame?": 
"I was blinded. Blinded by dark treachery masquerading as friendship. Perhaps if I had been more vigilant, then Mercer Frey wouldn't have lured me to my fate and stolen the Skeleton Key." 
''"Wait a moment... You're Gallus!"'':  
"I haven't heard that name in a long time. How do you know of me?" 
"I have the Key.":  
"The Key! You have the Skeleton Key! I never thought I'd see it again. And Mercer Frey?" 
"Dead.":  
"Then... it's over and my death wasn't in vain. I owe you a great deal, Nightingale."

From here, you will have the option of three replies:



No matter which option you choose to reply with, Gallus will have the same response:

"My only regret is that you had to undertake this task alone." 
"Karliah helped me." 
"Karliah... she's still alive? I feared she'd befallen the same fate, ending up a victim of Mercer's betrayal." 
"Then take the Key and right all the wrongs." 
"Nothing would bring me more pride than to return the Key, but I'm afraid it's impossible. From the moment I arrived here, I've felt myself... well... dying." 
"How can a spirit die?" 
"The Sepulcher isn't merely a temple or a vault to house the Key. Within these walls is the Ebonmere... a conduit to Nocturnal's realm of Evergloam. When Mercer stole the Key, that conduit closed, severely limiting our ties to her." 
''"Then I'll have to proceed alone."'' 
"I'm afraid so. I'm weakening, and I can feel myself slipping away. The years without restoration of my power have taken their toll. Whatever damage has been caused can only be corrected by following the Pilgrim's Path to the Ebonmere and replacing the Key."''

 If you inquire further about the Pilgrim's Path, Gallus will say ''"I wish I could help you, but I've been a prisoner in this very chamber for the last quarter century. The only possible help I've come across are the remains of some poor fellow who was trying to follow in your footsteps. Perhaps his journal can help?"'' This will present you with an optional goal to retrieve Nystrom's journal, which contains clues about the five "tests" you will face along the way. The journal is found on Nystrom's remains on the east side of the chamber, along with a leveled, enchanted weapon.

The First Test
 
thumb|right|Nightingale Sentinels in the room of the first test

Continue into the Sepulcher. In the first chamber, you will notice two Nightingale Sentinels reside here. One will be found in a room to the left, along with an alchemy lab and a secret chamber. The door to the secret chamber can be opened by pressing a button found behind the table. The other Sentinel can be found wandering near the steps in the main room. Starting a fight risks gaining the attention of both of them, so you can either choose to fight or try your luck in sneaking past them.

Proceed onward into the next hallway, being mindful of the pressure plate in the hallway. On top of the stairs ahead, there is another Sentinel keeping watch. Note that the stairs themselves are pitch-black, but do not have any traps. Be careful however: if you use any form of light, it will likely attract the Sentinel.

The Second Test
 
thumb|right|The darkened room of the second test

The next chamber (and the second test you will face) is a room with brightly lit areas and a shadowy path running through them. Stick to the shadows here, since stepping into the light will result in continuous health damage that can quickly kill you. Note that if you're trying to level Restoration, this is a good place to do so; it is impossible to resist the damage (even with console commands or the Become Ethereal shout) as the damage caused by the light is scripted and will drain your health very rapidly (up to 100 points of damage per second) regardless of your level. The light damage is also affected by game difficulty, so be especially cautious if you are playing at higher difficulties. There are several tripwire-triggered dart traps along the shadowy path: the first one can be found as you make your way up the first flight of stairs, across the landing just ahead of you; the second tripwire is located just before you descend the second flight of stairs; the third tripwire is found just before you travel across a wooden bridge; the last one is located at the top of the last remaining stairs descending down.

Once you reach the end of the chamber, proceed onward through the hallway until you reach the next room.
 

The Third Test
 
thumb|right|A statue of Nocturnal in the room of the third test

The third chamber is located at the end of the hallway, and contains a statue of Nocturnal, a dead bandit found on the floor, and a wooden tray with an offering of gold and soul gems. The third test along the Pilgrim's Path requires you to give Nocturnal an offering she desires: Darkness. In order to do so, find the chains hidden behind the stone torches on either side.  Pulling both chains will put out the flames, creating darkness. This will cause a hidden passage to open from behind the statue, leading to a corridor and your fourth test.
 
The Fourth Test
 
thumb|right|The two paths in the room of the fourth test

The corridor that lies ahead has a path leading directly through to a door. However, this path contains multiple traps, including two pressure plates (which both trigger darts to be released from the ceiling) and a pendulum trap. If you choose to brave the pendulum trap, beware: at the end there is another pressure plate to the right which triggers a spear trap from multiple sides of the room. Opening the door ahead releases a battering ram from behind the door.

You can also choose to avoid that path by going through a master-leveled locked door (easily opened with use of the Skeleton Key), which is located to the left side just before the pendulum trap. This path leads to a small chamber which has two Nightingale Sentinels guarding the area. This area also contains a copy of the Lockpicking skill book Proper Lock Design (on the table near the southeast corner of the room), some gold, several bottles of poison, and other minor loot. A copy of the Sneak skill book Sacred Witness may be on the table near the altar on the northwest side (see bugs).

You may now continue through the corridors until you reach the door leading into the Twilight Sepulcher Inner Sanctum.

The Final Test
 
thumb|left|Returning the Skeleton Key to its rightful place
Proceed unopposed down a hallway and through a second set of doors, opening into a room with a well. It is advisable to save before jumping in due to a large number of potential bugs. You may suffer a small amount of health damage from the fall. Examine the skeletal remains of Anders, the thief who is mentioned in Nystrom's journal. A cutscene is triggered shortly afterwards, and the floor of the well descends to reveal a room with three closed doors and a lock at your feet (which requires the Skeleton Key). Use the key to re-open the Ebonmere. Nocturnal will then emerge from the Ebonmere.
thumb|right|Nocturnal emerging from the Ebonmere
Nocturnal: ''"My, my. What do we have here? It's been a number of years since I've set foot on your world. Or perhaps it's been moments. One tends to lose track. So... once again the Key has been stolen and a "champion" returns it to the Sepulcher. Now that Ebonmere has been restored, you stand before me awaiting your accolades; a pat on your head... a kiss on your cheek. What you fail to realize is your actions were expected and represent nothing more than the fulfillment of your agreement. Don't mistake my tone for displeasure, after all, you've obediently performed your duties to the letter. But we both know this has little to do with honor and oaths and loyalty. It's about the reward; the prize. Fear not. You'll have your trinkets, your desire for power, your hunger for wealth. I bid you to drink deeply from the Ebonmere, mortal. For this is where the Agent of Nocturnal is born. The Oath has been struck, the die has been cast and your fate awaits you in the Evergloam. Farewell, Nightingale. See to it the Key stays this time, won't you?"

You are now directed to speak with Karliah, who has appeared inside the Sepulcher. 

"I'm glad you were able to bring the Key back safely. Nocturnal seemed quite pleased with your efforts." 
"Pleased? She sounded indifferent.": 
"I wouldn't take that to heart. It's her way. Think of her as a scolding mother continually pushing you harder to be successful; outwardly sounding angry but silently content. I assure you, had she been displeased with you, we wouldn't be having this conversation." 
''"What's this about becoming an Agent of Nocturnal?"'': 
"The circles at the base of the Ebonmere imbue you with powers befitting a Nightingale Agent. The crescent moon represents the Agent of Shadow, the half moon for the Agent of Subterfuge and the full moon for the Agent of Strife."

Now you are able to select either of the three Agents of Nocturnal: 

Agent of Shadow (Crescent Moon) - Use this power to be invisible for 2 minutes while sneaking.
:"The   is the master of remaining unseen. They are able to manipulate the darkness and use it to their advantage. 
:On moonlit nights or in darkened rooms, this agent literally becomes invisible."
Agent of Subterfuge (Half Moon) - Use this power to cause all nearby enemies to fight each other for 30 seconds. 
:"The Agent of Subterfuge utilizes shadow to cloud the judgement of those around him.  
:By weaving the darkness to their will, this agent can manipulate others into fighting for the Nightingale for a limited time."
Agent of Strife (Full Moon) - Use this power to invoke a powerful life-drain effect. 
:"  Agent of Strife can send forth a tendril of pure darkness into the heart of another, causing great injury to them.  
:''At the same time, this tether will bolster the agent's own life force, making him stronger.""

If you ask Karliah why you cannot be all three Agents at once, she will respond with "This is Nocturnal's way of maintaining balance. If you ever feel the need to change your abilities, you can return to the Sepulcher and step onto a different circle. Be warned that once you've chosen, you can't reselect for at least a day."

"So what now?" 
"Now, your life as a Nightingale begins. Should the need arise, you'll be summoned to the Sepulcher in order to defend it." 
"And you?" 
"The Guild has welcomed me back with open arms. I feel like a void in my life has finally been filled. I only hope that this isn't an ending to things, but actually the beginning." 
"The beginning of what?" 
"Why, perhaps the greatest crime spree Skyrim's ever known. There are pockets brimming with coin and coffers overflowing with riches ripe for the picking. We may be Nightingales, but in our hearts we're still thieves and we're damn good at what we do."'' 

You can now return to the Nightingale Hall and use it as a home if you wish. Karliah will also reside there. Before you leave the Twilight Sepulcher however, there is a short cutscene where Gallus appears and speaks to Karliah before entering the Evergloam.
thumb|right|Karliah's final farewell to Gallus
Gallus: "Karliah?" 
Karliah: ''"Gallus! I feared I would never see you again. I was afraid you'd become like the others." 
Gallus: "If it were not for the actions of this Nightingale, your fears would have come true. He/She honors us all." 
Karliah: "What will you do now, my love?" 
Gallus: "Nocturnal calls me to the Evergloam. My contract has been fulfilled." 
Karliah: "Will I ever see you again?" 
Gallus: "When your debt to Nocturnal has been paid, we'll embrace once again." 
Karliah: "Farewell, Gallus. Eyes open... walk with the shadows." 
Gallus: "Goodbye, Karliah." 

Approaching Karliah again and asking where Gallus went, she will respond by saying:
 
"Gallus's Oath has been paid. His actions have satisfied the terms. Now his spirit becomes one with the Evergloam... the realm of perpetual twilight and the cradle of shadow." 
''"So, he's gone?"'' 
"No, not gone... he's become one with the shadows. This is the greatest honor a Nightingale can possibly achieve. In death, he's become a part of that which we use to live."  
''"They're a part of the darkness around us?"'' 
"Absolutely. When we say "walk with the shadows," we are asking those Nightingales who have passed on to protect us. It's believed that they are literally what guides our uncanny luck... by placing their hands in ours. That's why the Ebonmere needed to be reopened. Without it, there's no way Nocturnal was able to allow them through."''	

To exit the Sepulcher, you can enter through either of the portals surrounding the Ebonmere. The portals will take you directly to the entrance of the Sepulcher, and if you look back, you will notice that the path that once led to the Pilgrim's Path now has a portal which will take you directly to the Inner Sanctum.

Returning Home

Once you've returned to the Thieves Guild, Brynjolf will greet you by remarking, ''"It's good to see you in one piece lad/lass!" He will then go on to say: "I just wanted to give you a proper thank you for everything you've done. The Guild is back on its feet again and on its way to a prosperous future."'' He will also ask about the Skeleton Key. When you say that you've returned it back to the Sepulcher, Brynjolf will reply: ''"That's it then. After all of those years of helplessly watching the Guild decline. But enough of that... I'm confident that with you in charge, we'll soon have more gold than we could possibly spend." Asking where he will be from now on will cause him to say: "I'll be down here, trying to coordinate everything with Delvin and Vex; to make sure the coin keeps flowing... and no one skims! If you still feel like doing some jobs, I'm sure Delvin and Vex have more than their fair share to give out. Either way, it's been a pleasure, my friend. Here's to the future of the Guild. May it last another thousand years!"''

If you have already completed the reputation quests, then you can now complete Under New Management, the last main quest available for the Thieves Guild. However, you are still able to complete jobs given by either Delvin or Vex.

Achievements
One achievement is unlocked when you complete this quest:
 

Notes
The completion of this quest will remove the Skeleton Key from your inventory permanently.
You cannot bring followers into the Twilight Sepulcher with you, though the standard reminder may fail to appear.
If you already have Nystrom's journal when you get the objective to retrieve it, re-read the book to complete the objective.

Bugs
 
  The following console command will fix this:  .
  Alternatively, if you wish to keep it, using   will drop the journal and not delete it.
 
Solution: If you go to the right around the door of the Pilgrim's Path, you will see a glitched area that can appear blue. You will also see the inside of the Pilgrim's Path. Use the Whirlwind Sprint shout to jump the gap and gain entrance to the path. Falling will either return you to the entrance area or kill you, depending on how you fall. The objective will not reappear until you talk to Nocturnal near the end of the quest.
 
 If Karliah is not showing up, it is possible to finish the quest with the console. While Nocturnal speaks, spawn Karliah with  . When Nocturnal is finished, you may need to update the quest with  .
 
 
This seems to be caused by completing Hard Answers a second time.
It helps to wait for a few hours after inserting the key. The game will reload upon completion of the wait with Karliah where she needs to be.
 
 

Quest Stages