Online:Draugr Dilemma

Quick Walkthrough
#Speak to the adventurers outside Exile's Barrow or the Orcs in the nearby village.
#Rescue Narsis Dren within the barrow and find the central chamber.
#Explore both wings of the barrow to recover tablet pieces and investigate the four engravings.
#Repair the tablets in the central chamber and activate them in the same order as the engravings.
#Defeat Arthosiis‎.
#Decide the fate of Dren, and return outside for your reward.

Detailed Walkthrough
The sequence for the lock is the order of the events depicted in the panels (Triumph, Exodus, Restoration, Ascension). 

Once in the treasure chamber, you have a choice on how to handle Narsis. You can trick him into a sarcophagus, and leave him as you originally found him, or you can order him to confess to the villagers. If you order him to confess, he dashes off ahead of you to tell them how awesome he is. 

You find him on a stage telling a heavily edited tale of his heroism involving lightning reflexes and two daggers, which he hastily pauses once you approach.

:''"We did good work today, my friend! You should be proud! Now if you'll excuse me, I have to finish my tale and then accept compensation from my adoring public!"
:That's quite a tale you were telling the village.
:"Every story needs a little embellishment. Surely you've read my books? I know how to hold an audience's attention!"
:I can't believe you're going to profit from this when it was all your fault.
:"The draugr dilemma? That was an unfortunate accident. But I acquired a rare dragon priest mask. And the draugr have begun returning to their slumber. All thanks for my efforts. And with your help, of course."

Now you can persuade him to give the villagers some gold in compensation, or ask him to tell Mazgroth the truth.

:[Persuade] You got the dragon mask. These poor villagers deserve some gold for the trouble you caused them.
:"Very well, if you insist. I'll speak to Mazgroth. But don't think this makes you better than me, do-gooder. I knew you weren't cut out for adventuring the moment I saw you. And you know this means I won't be mentioning you in my next book."

Narsis Dren will then walk to Mazgroth and offer her compensation:

:"My good woman, I can't in good conscience take gold from your clan. In fact, I'm giving some gold to you. What I found in the barrow more than compensates me for my time."

After which he will promptly run out of the village. Speaking to Mazgroth, she will be quite satisfied with the results:

:"It seems that the famous adventurer found something worthwhile in the barrow. He even waived his fee for helping us."
:The draugr have been dealt with and Dren wants to help out the village with a little gold.
:"We're not so proud that we'd turn down gold. But this isn't my first hunt. I know the Dark Elf's not doing this out of the goodness of his heart. It's only fair that you share the profit."'

Alternatively:
:I think Mazgroth deserves to hear the true story of what happened in that barrow.
:''"Very well, if you insist. But it won't make any difference, do-gooder. My version of the tale is more exciting. You're just going to come across as petty and jealous. Now off with you. And don't expect a mention in my next book."

Mazgroth is nearby, and takes the news in stride.

:"Welcome back. Let me guess. From that look on your face, Narsis Dren wasn't completely honest with us when I hired him."
:Not completely. He accidentally disturbed the draugr while he was exploring the barrow.
:"I knew his arrival in the village right after the draugr appeared was a bit too convenient. I've seen his type in my travels. Arrogant, sneaky, but mostly harmless. Probably had you do all the hard work, too."
:With the dragon priest dealt with, the draugr should go back to their rest now.
:"I suppose Narsis Dren helped us, after all. It's no small feat when a wind-filled Dark Elf actually accomplishes something. We call that a "little victory.""
:At least he dealt with your draugr problem.
:"A problem he created! We could deal with a few draugr, but we try to avoid constantly fighting with our neighbors. Here. Since I'm sure you did all the work, take the gold I was going to pay him."''

Notes
You can find Narsis Dren's journal while exploring the barrow, which reveals that it is his fault the draugr have awakened. You can confront him about it in dialogue after finding the journal.
If you choose to leave Narsis locked in the sarcophagus, he will comment on it during the quest Ancestral Adversity on Vvardenfell.

Bugs
 
Logging out and back in fixes the issue.

Quest Stages