The Obsidian Crown
While the origin of the diamonds is unknown, they are known to focus the arcane abilities of Thraess. The focus provided by the diamond eliminates the mental fatigue of maintaining spells. Many Thraess have their El’ildar diamonds crafted into their swords, staffs or jewelry.
The main identifying feature is how the power of Thraek pulsates within the inky blackness of the jewel like fire in darkness.
Those not elevated to the Thraess appear to be unaffected by the pulsating diamond. However, folklore says that anyone in possession of an El’ildar diamond will be promoted to positions of power and can easily influence the decisions of others.