Thornhill Manor is the estate of House Thornhill. The house bears a private mirror directly to the interior of Redelav Tower, used only by the "paramour" of The Countess. The house has been owned by Duke Theotar for eons, until he was banished to the Ember Ward by Sire Denathrius for participating in Prince Renathal's rebellion.
He has since reclaimed his home by killing Viscount Nicolae.
- It bears the same name as the Thornhill Estate in the TV show Riverdale.
- The use of a small separate house for lovers, a "petit maison", was a concept used by 18th century French aristocracy, most exemplified in the novel Les Liaisons Dangereuses by Choderlos des Laclos.