You must travel to the room
Find the sword and return to Bodley. Now that you have the sword and brazier you can summon Jarien and Sothos and slay them. To do this you must travel to the room they were killed in. The room is the last room in Scarlet Stratholme where you fight the Grand Crusader. You must kill the Requiem gold accounts Grand Crusader and then use the brazier to summon them. Once you have defeated them you can then loot the left piece of Lord Valthalak Amulet and return to Bodley.