Once you kill the vigilant you should be able to make it down to where the mace is and get the next part of the quest after that the main door should be unlocked.
Skyrim the house of horrors door locked.
Offer to help and the quest begins.
The dragonborn may offer to accompany him.
The only way to get into that house is with the stendarr dude.
Tyranus suggested that we make a break for it and i concurred but when we reached the front door now unpickably locked a ghoulish voice commanded me to kill him which i took to mean my companion the vigiliant of stendarr.
Then you two fight and you kill him.
He is torn whether to enter the haunted house or not.
This daedric quest rewards the mace of molag bal.
I can t get out the front door to markath.
Vigilant tyranus a vigilant of stendarr will ask if you know anything about the house.
Search the abandoned house edit edit source entering the abandoned house about to enter the cellar area via door the house becomes alive telling the dragonborn to kill or be killed by the vigilant tyranus.
This quest begins outside the abandoned house in markarth.
Talk to molag bal.
Upon striking logrolf with the mace he may glitch out of the cage molag bal has erected for him.
Tyranus will come to the conclusion that this place is the home of a powerful daedra and run away.
There is no known fix except to revert to an earlier save.
He runs down the stairs then runs back upstairs wanting to get out and escape.
Went through the dialog went to leave the house now the door is locked key required.
Follow tyranus who will be running towards the exit.
On your way you will head the daedra calling you to kill the vigilant screen above.
Here is my question in the house of horrors daedra quest in markarth after killing vigilant tyranus and going to the daedra s altar and being told to find the priest of boethia i m now locked in the house.
The door of house does not lock automatically and may lock after talking to molag bal.
It says a key is required yet i can t find one and see no mention of it anywhere online.
Again i m not in the habit of killing npcs with whom i have no quarrell so i continued to look for an exit.
This traps the dragonborn inside of the house.
Interact with the door screen above and they will turn out to be locked.