|Book Universe||The Demonata|
|First appearance||"Lord Loss"|
|Last appearance||"Hell's Heroes"|
Dervish's mansion is in Carcery Vale. He bought an old place, and then did it up over the years until it was a mansion. His study is filled with books on the occult, and he has lots of bedrooms. His mansion once belonged to the infamous Lord Sheftree who fed a baby to piranhas. Dervish adorns the walls of the mansion with many weapons.
The cellar is the most important part of the house. It is a cave built into the rock, with a locked entrance from outside and a hidden entrance from the wine cellar. He uses it when he needs to make deals with demons, such as curing people of the family curse. This is why it is the only place in Carcery Vale that is not protected against demons.