She reveals that the Dark Brotherhood is aware of their murderous deed and is pleased that Grelod is dead, but since the Aretino child performed the Black Sacrament, they demand that a debt be paid for the kill that was stolen from them. A Dark Brotherhood assassin named Astrid will speak to them. The Dragonborn will awake in an abandoned shack, located in the marshes north of Morthal. The quest typically begins after the Dragonborn has received the Mysterious Note from the courier and sleeps in a bed, however, sleeping in a bed even before receiving the note may trigger it. There are two ways to complete this quest, the first is to follow the orders given by Astrid, the assassin. Kill Astrid ( Optional: will fail the quest and start ' Destroy the Dark Brotherhood!').Astrid will only give me the key if I kill someone she has taken captive, to 'repay my debt.' Objectives I have been taken captive and moved to some remote shack. Astrid, of the Dark Brotherhood, informed me that by killing Grelod the Kind, I have robbed her organization of a kill.