QUEST: "Blood on the Ice"
I see there are a few ways to start the quest, I started it by finding a woman dead in the graveyard.
Then I talked to Jarleif and got permission to investigate. While wandering around the city I stumbled upon the house the killer uses. This made the quest objective go to "Enter the house"
1. I found the house and got the amulet, pamphlets, and journals.
2. I talk to Jiola Giordanno.
3. I took the amulet to Calixto. He told me Wuunferth is the criminal.
4. I do not sell the amulet to Calixto.
5. I tell Jarleif that Wuunferth is the killer.
6. I steal Calixto's safe key and open the safe, finding a journal implicating him for the murders.
7. I am unable to talk to Calixto or Jarleif about it so I give up and go elsewhere.
Later I return to the city to find a woman dead on the street next to the tavern. I talk to a guard and he refers me to Wuunferth.
(It is nighttime, this may be important?)
1. I immediately visit Wuunferth and tell him the killer struck again.
2. He sends me to the Stone District to try and catch the killer.
3. I exit the keep, it is still nighttime and I head to the stone district. I go down towards the tavern and see a guy sprint away from where the girl was killed by the tavern earlier.
4. I chase him to the house the killer uses. I enter the house he sees me and attacks me. I attack him back. He is injured, but I cannot kill him. I cannot talk to him or pickpocket him. He recovers and I attack him again, but I cannot kill him. I leave the zone and come back in, cannot kill him or talk to him.
I attempted to remove his Essential flag using "SetEssential HisCode 0" and I tried using the console "Kill" command to see if it would let me kill him to finish the quest, but I was unable to remove his essential flag. I waited in game for days, but he never leaves the house again.
I don't want to use the console command to complete the quest because if I do Wuunferth is still in jail and Calixto stays in the house (possibly permanently?).
I know a way around this and how to complete it legit, though you'll have to have a save before you started the mission, or at least, before you told Jaleif that Wuunferth was the killer.
Firstly you have to sell the amulet to Calixto when you have the opportunity otherwise the amulet will not be transformed into the Necromancers Amulet and it will also be stuck in your inventory as a quest item even if you complete the quest.
The second thing is when you obtain the evidence and speak to that elf chick, DO NOT follow her advice and talk to Jaleif, instead go to Wuunferth's quarters, located in the castle upstairs through the door on your left as you enter the main hall, and talk to him about him being a necromancer, he will then deny it, tell you that the amulet was the necromancers amulet and that if you hang around the market district at might there will be another attack.
When you discover Calixto murdering the girl you MUST kill him before he reaches the house or it will glitch out and he cannot die.
Also after doing this quest, you have the option of buying the Hjerim House, or you can buy it before you do the mission but are unable to upgrade the house until you complete the quest.
The problem with the house however is the blood stains and items such as the altar and all the skeletons and stuff are not removed from the house when you buy it or upgrade it, meaning that amongst all your stuff the walls will be still be covered in blood and the secret room (which becomes the alchemy and enchanting room) still has the massive altar in the way and covered in blood and bones from the quest. Also i am unable to use any of the weapon racks, wall plaques or bookshelves in the house. However i cannot use any other weapon racks or shelves or plaques in any other houses, in fact i didn't even know you could use them until i played skyrim at my mates house and he was playing on his xbox and tv next to me and showed me his stock of unique weapons on his racks and wall hangings, so i was pretty pissed and jealous as you can imagine.
I still have the amulet from this quest stuck in my inventory and am unable to drop it, and because i didn't sell it to calixto it did not upgrade to the necromancers amulet so it is useless, takes up space and weighs..... all this glitched undroppable quest items are really annoying me.