Doing the quest Undead Infestation on the part where I'm supposed to defend the haven from Sagum and his thralls. I've killed every hostile npc around the premises and rezzed all the friendly ones and everyone is engaging combat with Sagum but he has a buff on him making him immune to all damage. The buff says: Determined: Determined to survive and immune to damage. Source: Sagum the Foul Time left: 23h. I have scoured the building and haven't found any sort of mechanism to disable the debuff and nothing I do seems to work. What are you supposed to do to complete this quest?
Thanks in advance.