Online:Crimes of the Past

Quick Walkthrough
 

#Find a clue to the hiding place
#Search the Central Crypt
#Read the letter in Althen's Pack
#Talk to Althen
#Find House Dorell key
#Find House Tamrith key
#Activate south lever
#Activate north lever
#Enter the Sanguine Barrows Crypt
#Talk to Althen
#Help Althen escape or
#Talk to Althen then take Althen to the Ring of Daggers (Optional)

Detailed Walkthrough
 
Tracking a War Criminal
On the road between Moira's Hope and Hoarfrost Downs you'll find Marisette, a member of the Ring of Daggers. Talk to her to start the quest. She'll ask you if someone could be forgiven for heinous crimes like slaughtering innocents, explaining that she's after a man named Gerard Althen who ordered the massacre of hundreds of innocent people during the Ranser's War. However, she needs your help bringing him in. If you ask some more questions, she will tell you this contract came from King Emeric himself. After agreeing to help, head a bit south to the map marker. Here you'll find a letter from Gerard Althen to Turenn, who's now dead. The letter tells of his try to escape from the ring of daggers, including his current hiding place Sanguine Barrows. Head to Sanguine Barrows and knock on the door.

A Changed Man
Althen will be inside, at first refusing to open the door for you. After telling him Turenn is dead, he will be shocked revealing he needed Turenn to open the door, as the door only opens from the outside. Because of this, he will tell you how to open the door, but asks you to have mercy as he's a changed man. To make a stronger case, he wants you to search for a letter in his pack to gain some credibility. He asks you to read it and hopes you show mercy, but says he will accept his fate if you want to turn him in never the less. Go north-west, his pack is behind an altar just in front of Tribulation Crypt. The letter will show you Althen put in a lot of effort into helping an orphanage called the Orsinium Home for Displaced Children, giving them gift and gold, as well as helping orcish scholars by giving them rare tomes that restored knowledge that was believed lost of all time. Overall, it's full of praise for his help. It also mentions Althen wanted to stay anonymous, showing he wasn't just trying to make himself look good. Return to Sanguines Barrows Crypt and talk to Althen again.

Opening the door
Althen will express desperation being stuck inside the tomb. He'll explain the door is controlled by two levers, which in return require keys that are buried inside the Dorell and Tamrith family crypts. Go east to the Tamrith family tomb. Head inside, kill the troll, and grab the key. Now go south-west to the Dorell family tomb. Again, head inside, kill the troll, and grab the key. Return to Sanguine Barrows, and activate the levers beneath the altars on both sides. Enter the now unlocked crypt and talk to Althen.

Deciding a man's fate
Althen will tell you he's not trying to deny his past wrongdoings, nor argue they should be forgiven, but that he did try to make amends in the years since the war. He rather no hears your choice now and instead wants you to take your time. Now, you can either hand him in into the Ring of Daggers, or bring him to the other side of the area to set him free. Asking him, besides his big achievements he did some smaller things to be a good and helpful man, like feeding stray dogs, opening door for elderly ladies, and giving candy to children.

Handing Althen in
Walk with Althen to Hoarfrost Downs. He will be arrested and accept his fate. Marisette will be very rude and unforgiving to him, despite knowing he tried to make amends, and make sure that Althen suffers.

Setting Althen free
Walk with Althen towards the Crypt of Hearts, near the end of the map south-east. Once there, talk to him to finish the quest. He'll promise you to try to better himself even more. Afterwards, a woman named Gabria will appear who will them him Turenn planned everything, and that there is a place set up for him as a merchant in Orsinium, after which she takes him away. Marisette will disappear from Hoalfrost Downs.
 

Notes
 

Bugs
 
 
Since it's after finishing the quest, it has no impact beside missed dialogue.

Quest Stages