Faelian has been marked by the Dark Brotherhood and the Hero is assigned to kill him and make it look like the Brotherhood was not involved. Like many Dark Brotherhood quests, the Hero may choose to handle Faelian in a way that suits their playstyle. It is possible to bribe him with skooma (he even refers the Hero to a dealer) to earn his trust. Persuading Atraena will give them the location of Lorkmir's house, where it's evident he retreats to use skooma. Alternatively, the Hero can choose to dispose of Faelian in public, or in an un-subtle fashion. This forfeits any bonuses, but fulfills the contract nonetheless.