The Ember is hidden in a chest above one of the Dark Wraiths but to reach it you need to defeat one of the two Mass of Souls first. Pass the Mass of Souls you will find a lift on the left and some stairs on the right. It is the stairs you need to take. Then follow the path all the way around, up some more steps and then down to a ledge.
Strongest Weapon Trophy
- Allows Normal Weapons to reach +15