Blightwraith

Blightwraith is a type of wraith and considered the highest echelon of Spirits,

Home World and Behaviour
They are found in the Ghostlands, homeworld of the undead, they would often lead hordes of specters there,

Known Traits and Powers
Blessed with human intelligence from the very start, They're called as Noble Ghosts by many, They require the power called Blight, Created by one of the Primordials, Blightfather himself,

In Story
The Blightfather turned Casper's girlfriend Lyra into one after Jake completing the Tutorial, Since she is sealed in Casper's necklace, She rarely comes out to show her abilities, often communicating via telepathy which could be due to she being bonded to Casper, Similarly how Sylphie's emotions could be discerned by Jake due to the bond.