Castra Dame

Castra Dame was a female Drow paladin turned vampire spawn, who was seen working alongside the Cult of the Dragon outside of Tamvrien. She was leading the efforts to turn clerics and paladins in Tamvrien into dragon-bonded blue wilders (bonded to Dazzlegleam) that would in turn be used as agents of the cult in their respective churches. 
While the party was in Tamvrien, the cult kidnapped Deacon, torturing him for information about Andrith and the white dragon mask. On Castra's orders, the tips of Deacon's ears were cut off as part of the torture. 
The party first saw her when Olivia and Jeth scouted invisibly into Dazzlegleam's lair. She and Verde were in an argument and Verde started fighting her, weakening her. The rest of the party followed after Olivia and Castra was fought, killed, and beheaded while Verde fought for a moment and then fled.