This quest is picked up in the beginning of the Iron Tomb by the ghost of Eliam. In order to obtain the Bag of Amulets you will have to venture deep into the dungeon. Past the second boss you will enter a long hallway. At the end of this hallway you will find yourself standing on a balcony. Take the stairs down to the bottom floor. On this level you will have to huddle your group near the orbs in order to help control and kill the shades that will spawn constantly. Follow the orb placement to the southern most reaches of the room. Here you will be able to obtain the quest objective. Finish the dungeon and bring these amulets to Faceless Man or Shyla Starhearth for your reward.