How to obtain the Elekk Soulshape
This soul shape dropped in Torghast Tower of the Damned - Upper Reaches Layer 13 Floor 2. This soul shape can drop on any floor. This is just the one it dropped on for me.
You will find this soul shape as a chained Lost Soul. All you need to do to free it is click it, and the quest will pop up. Accept it and turn it into Lady Muun.