Below, you can find the full FFXIV: Heavensward item info for the Soul of the Dark Knight item. This item is a Soul Crystal and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.
Quest Items Amulets
 |
Soul of the Dark Knight |
|||
|
Soul Crystal DRK Level: 30 |
Item Level: 30
NPC:  0 |
|||
|
Upon the surface of this multi-aspected crystal are carved the myriad deeds of dark knights from eras past. |
||||