Kastra was the original Treasurer of the Dread Cult.
The Dread are a cult of Dragon worshipers in Terrinoth. They plotted to bring back the chief of the dragons: High Lord Margath, who they believed was not killed but instead imprisoned. The cult originated as a splinter sect of the Cult of Kellos, and operated from a secret lair in the crypts of Vynelvale. Judging by the tapestries in the crypt, Kastra was one of the cultists who split off and formed a new group which tried to control Margath instead of freeing him.
References
- Descent: Journeys in the Dark (Second Edition): Embers of Dread